fix python

Author: freeznet

.github/workflows/test-helm-charts.yml

@@ -62,7 +62,7 @@ jobs:
 
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.9
 
       - name: Set up chart-testing
         uses: helm/[email protected]