Bump platformdirs from 4.3.7 to 4.3.8

Bumps [platformdirs](https://github.com/tox-dev/platformdirs) from 4.3.7 to 4.3.8.
- [Release notes](https://github.com/tox-dev/platformdirs/releases)
- [Changelog](https://github.com/tox-dev/platformdirs/blob/main/CHANGES.rst)
- [Commits](tox-dev/platformdirs@4.3.7...4.3.8)

---
updated-dependencies:
- dependency-name: platformdirs
  dependency-version: 4.3.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -20,7 +20,7 @@ mkdocs-rss-plugin==1.17.1
 packaging==25.0
 paginate==0.5.7
 pathspec==0.12.1
-platformdirs==4.3.7
+platformdirs==4.3.8
 Pygments==2.19.1
 pymdown-extensions==10.15
 python-dateutil==2.9.0.post0