Update docker.io/postgres Docker tag to v18

.gitea/workflows/render-manifests.yaml

@@ -118,9 +118,6 @@ jobs:
               | while read cmd; do echo "$cmd" | sh; done || true
           done
 
-          echo ">> Update repository cache ..."
-          helm repo update
-
           echo "----"
 
       - name: Remove Changed Manifest Files
@@ -166,7 +163,7 @@ jobs:
 
               echo ""
               echo ">> Building helm dependency ..."
-              helm dependency build --skip-refresh
+              helm dependency build
 
               echo ""
               echo ">> Linting helm ..."