Bump the dependencies group with 3 updates

Bumps the dependencies group with 3 updates: [coverage](https://github.com/nedbat/coveragepy), [mypy](https://github.com/python/mypy) and [pytest](https://github.com/pytest-dev/pytest).


Updates `coverage` from 7.0.3 to 7.2.7
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.0.3...7.2.7)

Updates `mypy` from 0.991 to 1.4.1
- [Commits](python/mypy@v0.991...v1.4.1)

Updates `pytest` from 7.2.0 to 7.4.0
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.2.0...7.4.0)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: mypy
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dependencies
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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