chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/_async_docstrings_check.yaml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_VERSION }}
 

.github/workflows/build_and_deploy_docs.yaml

@@ -50,7 +50,7 @@ jobs:
           git push
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_VERSION }}