Update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/pythonapp.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set up Python 3.7
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.13
     - name: Install dependencies