Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/pythonapp.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Set up Python 3.7
       uses: actions/setup-python@v5
       with: