Limit platformdirs as well

Author: ilevkivskyi

test-requirements.in

@@ -13,3 +13,4 @@ pytest-cov>=2.10.0
 setuptools>=75.1.0
 tomli>=1.1.0  # needed even on py311+ so the self check passes with --python-version 3.9
 pre_commit>=3.5.0
+platformdirs<4.5.0  # latest version is not available on 3.9 that we still support

test-requirements.txt

@@ -34,8 +34,10 @@ packaging==25.0
     # via pytest
 pathspec==0.12.1
     # via -r mypy-requirements.txt
-platformdirs==4.5.0
-    # via virtualenv
+platformdirs==4.4.0
+    # via
+    #   -r test-requirements.in
+    #   virtualenv
 pluggy==1.6.0
     # via
     #   pytest