[actions] pin Helm version to v3

Author: capcom6

.github/workflows/publish-helm-chart.yml

@@ -36,6 +36,8 @@ jobs:
 
       - name: Set up Helm
         uses: azure/setup-helm@v4
+        with:
+          version: v3.19.2
 
       - name: Lint Helm chart
         run: helm lint deployments/helm-chart