chore: update Helm version in helm-unittest workflow to v4.1.0

Author: jsbroks

.github/workflows/helm-unittest.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: Set up Helm
         uses: azure/setup-helm@v4.2.0
         with:
-          version: v3.14.4
+          version: v4.1.0
 
       - name: Install helm-unittest plugin
         run: helm plugin install https://github.com/helm-unittest/helm-unittest