🌱 Bump platformdirs from 3.10.0 to 4.2.0 (#620)

Bumps [platformdirs](https://github.com/platformdirs/platformdirs) from 3.10.0 to 4.2.0.
- [Release notes](https://github.com/platformdirs/platformdirs/releases)
- [Changelog](https://github.com/platformdirs/platformdirs/blob/main/CHANGES.rst)
- [Commits](tox-dev/platformdirs@3.10.0...4.2.0)

---
updated-dependencies:
- dependency-name: platformdirs
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements.txt

@@ -19,7 +19,7 @@ mkdocs-material-extensions==1.3.1
 packaging==23.1
 paginate==0.5.6
 pathspec==0.12.1
-platformdirs==3.10.0
+platformdirs==4.2.0
 Pygments==2.17.2
 pymdown-extensions==10.1
 pyquery==2.0.0