chore: remove platformdirs (#2774)

In this PR:
- Remove a redundant dependency, `platformdirs`.

Author: JoeWang1127

library_generation/requirements.txt

@@ -11,7 +11,6 @@ MarkupSafe==2.1.5
 mypy-extensions==1.0.0
 packaging==23.2
 pathspec==0.12.1
-platformdirs==4.2.1
 PyYAML==6.0.1
 smmap==5.0.1
 typing==3.7.4.3