MAINT: 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:production
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -55,7 +55,7 @@ tests = [
     "numpy==1.26.4",
     "pandas==2.2.2",
     "panel==1.4.1",
-    "platformdirs==4.2.0",
+    "platformdirs==4.2.1",
     "plotly==5.21.0",
     "protobuf==4.25.3",
     "six==1.16.0",