deps: update actions/setup-python action to v6 (#7194)

Co-authored-by: Blake Li <blakeli@google.com>

Author: renovate-bot

.github/workflows/update-readme-table.yaml

@@ -18,7 +18,7 @@ jobs:
  uses: actions/checkout@v4
 
  - name: Set up Python
- uses: actions/setup-python@v5
+ uses: actions/setup-python@v6
  with:
  python-version: '3.9'