chore: disable verification for helm-unittest plugin installation

Author: jsbroks

.github/workflows/helm-unittest.yaml

@@ -17,7 +17,7 @@ jobs:
           version: v4.1.0
 
       - name: Install helm-unittest plugin
-        run: helm plugin install https://github.com/helm-unittest/helm-unittest
+        run: helm plugin install https://github.com/helm-unittest/helm-unittest --verify=false
 
       - name: Run helm-unittest
         run: ./charts/run-tests.sh