chore(deps): update helm/chart-testing-action action to v2.8.0

Author: renovate[bot]

.github/workflows/helm-lint-and-install.yaml

@@ -32,7 +32,7 @@ jobs:
           check-latest: true
 
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.7.0
+        uses: helm/chart-testing-action@v2.8.0
 
       - name: Add external repositories
         run: |