fix version

Author: Patrick Koss

.github/workflows/main.yml

@@ -58,7 +58,7 @@ jobs:
         run: make test
 
       - name: Run chart-testing (lint)
-        uses: helm/chart-testing-action@master
+        uses: helm/chart-testing-action@main
         with:
           command: lint
           config: .github/ct.yaml