chore(deps): update actions/setup-python action to v7 (#9363)

Author: renovate-bot

.github/workflows/docs.yaml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Setup Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: '3.14'
     - run: pip install --no-deps --require-hashes -r .kokoro/docs/docker/requirements.txt