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

Author: renovate[bot]

.github/workflows/job-test-chart.yml

@@ -53,7 +53,7 @@ jobs:
           python-version: '3.x'
           check-latest: true
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@0d28d3144d3a25ea2cc349d6e59901c4ff469b3b # v2.7.0
+        uses: helm/chart-testing-action@6ec842c01de15ebb84c8627d2744a0c2f2755c9f # v2.8.0
         with:
           version: 'v3.14.0'
           yamllint_version: '1.37.0'