Bump platformdirs from 4.2.0 to 4.2.1

Bumps [platformdirs](https://github.com/platformdirs/platformdirs) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/platformdirs/platformdirs/releases)
- [Changelog](https://github.com/platformdirs/platformdirs/blob/main/CHANGES.rst)
- [Commits](tox-dev/platformdirs@4.2.0...4.2.1)

---
updated-dependencies:
- dependency-name: platformdirs
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev.txt

@@ -5,7 +5,7 @@ filelock==3.13.4
 mypy-extensions==1.0.0
 packaging==24.0
 pathspec==0.12.1
-platformdirs==4.2.0
+platformdirs==4.2.1
 pluggy==1.5.0
 pylint==3.1.0
 pyparsing==3.1.2