Update Helm and chart-testing versions in CI workflow (#6212)

Author: jkroepke

.github/workflows/ci.yaml

@@ -21,6 +21,7 @@ jobs:
       - name: Set up Helm
         uses: azure/setup-helm@1a275c3b69536ee54be43f2070a358922e12c8d4 # v4.3.1
         with:
+          # renovate: github=helm/helm
           version: v3.12.0
 
       - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
@@ -29,6 +30,9 @@ jobs:
 
       - name: Set up chart-testing
         uses: helm/chart-testing-action@0d28d3144d3a25ea2cc349d6e59901c4ff469b3b # v2.7.0
+        with:
+          # renovate: github=helm/chart-testing
+          version: v3.14.0
 
       - name: Run chart-testing (list-changed)
         id: list-changed