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

Author: renovate[bot]

.github/workflows/lint-test.yaml

@@ -26,7 +26,7 @@ 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 Helm Repositories
         run: |