Bump pylint from 2.13.7 to 2.15.6

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.13.7 to 2.15.6.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Commits](pylint-dev/pylint@v2.13.7...v2.15.6)

---
updated-dependencies:
- dependency-name: pylint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]