Update azure/setup-helm action to v4

Author: renovate[bot]

.github/workflows/flink-operator-sync.yaml

@@ -28,7 +28,7 @@ jobs:
           python-version: "3.x"
 
       - name: Install Helm
-        uses: azure/setup-helm@v3
+        uses: azure/setup-helm@v4
         with:
           version: v3.13.1