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

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Set up Python 3.9
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Install pypa/build