Bumps the optional group with 16 updates:

| Package | From | To |
| --- | --- | --- |
| [pydoclint](https://github.com/jsh9/pydoclint) | `0.3.2` | `0.3.8` |
| [black](https://github.com/psf/black) | `23.9.1` | `23.12.1` |
| [isort](https://github.com/pycqa/isort) | `5.12.0` | `5.13.2` |
| [markdown](https://github.com/Python-Markdown/markdown) | `3.4.4` | `3.5.1` |
| [mkdocs-macros-plugin](https://github.com/fralau/mkdocs_macros_plugin) | `1.0.4` | `1.0.5` |
| [mkdocs-material](https://github.com/squidfunk/mkdocs-material) | `9.3.1` | `9.5.3` |
| [mkdocstrings[python]](https://github.com/mkdocstrings/mkdocstrings) | `0.23.0` | `0.24.0` |
| [frequenz-repo-config[lib]](https://github.com/frequenz-floss/frequenz-repo-config-python) | `0.7.5` | `0.8.0` |
| [mypy](https://github.com/python/mypy) | `1.5.1` | `1.8.0` |
| [types-markdown](https://github.com/python/typeshed) | `3.4.2.10` | `3.5.0.3` |
| [grpc-stubs](https://github.com/shabbyrobe/grpc-stubs) | `1.24.12` | `1.53.0.5` |
| [pylint](https://github.com/pylint-dev/pylint) | `3.0.2` | `3.0.3` |
| [pytest](https://github.com/pytest-dev/pytest) | `7.4.2` | `7.4.4` |
| [frequenz-repo-config[extra-lint-examples]](https://github.com/frequenz-floss/frequenz-repo-config-python) | `0.7.5` | `0.8.0` |
| [pytest-mock](https://github.com/pytest-dev/pytest-mock) | `3.11.1` | `3.12.0` |
| [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) | `0.21.1` | `0.23.2` |


Updates `pydoclint` from 0.3.2 to 0.3.8
- [Release notes](https://github.com/jsh9/pydoclint/releases)
- [Changelog](https://github.com/jsh9/pydoclint/blob/main/CHANGELOG.md)
- [Commits](jsh9/pydoclint@0.3.2...0.3.8)

Updates `black` from 23.9.1 to 23.12.1
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.9.1...23.12.1)

Updates `isort` from 5.12.0 to 5.13.2
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/main/CHANGELOG.md)
- [Commits](PyCQA/isort@5.12.0...5.13.2)

Updates `markdown` from 3.4.4 to 3.5.1
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/changelog.md)
- [Commits](Python-Markdown/markdown@3.4.4...3.5.1)

Updates `mkdocs-macros-plugin` from 1.0.4 to 1.0.5
- [Release notes](https://github.com/fralau/mkdocs_macros_plugin/releases)
- [Changelog](https://github.com/fralau/mkdocs_macros_plugin/blob/master/CHANGELOG.md)
- [Commits](fralau/mkdocs-macros-plugin@v1.0.4...v1.0.5)

Updates `mkdocs-material` from 9.3.1 to 9.5.3
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.3.1...9.5.3)

Updates `mkdocstrings[python]` from 0.23.0 to 0.24.0
- [Release notes](https://github.com/mkdocstrings/mkdocstrings/releases)
- [Changelog](https://github.com/mkdocstrings/mkdocstrings/blob/main/CHANGELOG.md)
- [Commits](mkdocstrings/mkdocstrings@0.23.0...0.24.0)

Updates `frequenz-repo-config[lib]` from 0.7.5 to 0.8.0
- [Release notes](https://github.com/frequenz-floss/frequenz-repo-config-python/releases)
- [Changelog](https://github.com/frequenz-floss/frequenz-repo-config-python/blob/v0.8.0/RELEASE_NOTES.md)
- [Commits](frequenz-floss/frequenz-repo-config-python@v0.7.5...v0.8.0)

Updates `mypy` from 1.5.1 to 1.8.0
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.5.1...v1.8.0)

Updates `types-markdown` from 3.4.2.10 to 3.5.0.3
- [Commits](https://github.com/python/typeshed/commits)

Updates `grpc-stubs` from 1.24.12 to 1.53.0.5
- [Commits](https://github.com/shabbyrobe/grpc-stubs/commits/1.53.0.5)

Updates `pylint` from 3.0.2 to 3.0.3
- [Release notes](https://github.com/pylint-dev/pylint/releases)
- [Commits](pylint-dev/pylint@v3.0.2...v3.0.3)

Updates `pytest` from 7.4.2 to 7.4.4
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.4.2...7.4.4)

Updates `frequenz-repo-config[extra-lint-examples]` from 0.7.5 to 0.8.0
- [Release notes](https://github.com/frequenz-floss/frequenz-repo-config-python/releases)
- [Changelog](https://github.com/frequenz-floss/frequenz-repo-config-python/blob/v0.8.0/RELEASE_NOTES.md)
- [Commits](frequenz-floss/frequenz-repo-config-python@v0.7.5...v0.8.0)

Updates `pytest-mock` from 3.11.1 to 3.12.0
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-mock@v3.11.1...v3.12.0)

Updates `pytest-asyncio` from 0.21.1 to 0.23.2
- [Release notes](https://github.com/pytest-dev/pytest-asyncio/releases)
- [Commits](pytest-dev/pytest-asyncio@v0.21.1...v0.23.2)

---
updated-dependencies:
- dependency-name: pydoclint
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: optional
- dependency-name: black
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: isort
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: markdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: mkdocs-macros-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: optional
- dependency-name: mkdocs-material
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: mkdocstrings[python]
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: frequenz-repo-config[lib]
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: mypy
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: types-markdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: grpc-stubs
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: pylint
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: optional
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: optional
- dependency-name: frequenz-repo-config[extra-lint-examples]
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: pytest-mock
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: pytest-asyncio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
...

Signed-off-by: dependabot[bot] <[email protected]>

It seems that the new version of `grpc-stubs` fixed this issue.

Signed-off-by: Leandro Lucarella <[email protected]>

It seems like the new `mkdocs-material` and `types-markdown` versions
fixed the issues that were causing the errors.

Signed-off-by: Leandro Lucarella <[email protected]>

The new version checks that the custom templates directory exists, and
we don't really use it, so we can remove the option.

Signed-off-by: Leandro Lucarella <[email protected]>