Update helm/chart-testing-action action to v2.7.0

Author: renovate[bot]

.github/workflows/test.yaml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: '3.x'
-      - uses: helm/chart-testing-action@v2.6.1
+      - uses: helm/chart-testing-action@v2.7.0
 
       # Lint
       - name: Lint charts