Bump astroid from 2.13.3 to 2.15.6

Bumps [astroid](https://github.com/PyCQA/astroid) from 2.13.3 to 2.15.6.
- [Release notes](https://github.com/PyCQA/astroid/releases)
- [Changelog](https://github.com/pylint-dev/astroid/blob/main/ChangeLog)
- [Commits](pylint-dev/astroid@v2.13.3...v2.15.6)

---
updated-dependencies:
- dependency-name: astroid
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements-lint.txt

@@ -1,6 +1,6 @@
 pep8==1.7.1
 flake8==5.0.4
-astroid==2.13.3; python_version >= '3.8'
+astroid==2.15.6; python_version >= '3.8'
 pylint==2.15.10; python_version >= '3.8'
 bandit==1.7.4; python_version >= '3.7'
 black==22.12.0; python_version >= '3.6' and implementation_name == "cpython"