Update dependency pytest-cases to ~=3.9.1

Author: renovate[bot]

setup.cfg

@@ -62,7 +62,7 @@ dev =
     isort~=6.0.0
     types-pytz~=2025.2.0.20250326
     pre-commit~=4.2.0
-    pytest-cases~=3.8.0
+    pytest-cases~=3.9.1
     pytest-cov~=6.1.1
     pytest_randomly~=3.16.0
     pytest~=8.3.4