Update actions/setup-python action to v6

Author: renovate[bot]

.github/actions/setup-python-env/action.yml

@@ -14,7 +14,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ inputs.python-version }}