Bump platformdirs from 3.5.1 to 3.8.0

Bumps [platformdirs](https://github.com/platformdirs/platformdirs) from 3.5.1 to 3.8.0.
- [Release notes](https://github.com/platformdirs/platformdirs/releases)
- [Changelog](https://github.com/platformdirs/platformdirs/blob/main/CHANGES.rst)
- [Commits](tox-dev/platformdirs@3.5.1...3.8.0)

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

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

requirements-dev.txt

@@ -50,7 +50,7 @@ packaging==23.1
     #   tox
 pathspec==0.11.1
     # via black
-platformdirs==3.5.1
+platformdirs==3.8.0
     # via
     #   black
     #   tox