Bump helm/chart-testing-action from 2.7.0 to 2.8.0

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: helm/chart-testing-action
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/helm-chart-ci.yml

@@ -60,7 +60,7 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Setup chart-testing
-        uses: helm/chart-testing-action@v2.7.0
+        uses: helm/chart-testing-action@v2.8.0
         with:
           version: ${{ env.CHART_TESTING_VERSION }}
 
@@ -146,7 +146,7 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Setup chart-testing
-        uses: helm/chart-testing-action@v2.7.0
+        uses: helm/chart-testing-action@v2.8.0
         with:
           version: ${{ env.CHART_TESTING_VERSION }}