Update validate_python.yml

.github/workflows/validate_python.yml

@@ -17,9 +17,9 @@ jobs:
     name: Lint
     steps:
       - name: Check out source repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@main
       - name: Set up Python environment
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@main
         with:
           python-version: "3.11"
       - name: flake8 Lint