Update GitHub Actions to use newer versions

Author: cclauss

.github/workflows/pythonapp.yml

@@ -21,9 +21,9 @@ jobs:
       matrix:
         python: [ '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
     steps:
-    - uses: actions/checkout@v4.2.2
+    - uses: actions/checkout@v5
     - name: Set up Python ${{ matrix.python }}
-      uses: actions/setup-python@v5.4.0
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python }}
         allow-prereleases: true