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

Author: renovate[bot]

.github/workflows/python-publish.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.13'
     - name: Install pypa/build