chore(deps): bump helm/chart-testing-action in the github-actions group (#148)

Bumps the github-actions group with 1 update: [helm/chart-testing-action](https://github.com/helm/chart-testing-action).


Updates `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@0d28d31...6ec842c)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -25,7 +25,7 @@ jobs:
           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
 
       - name: Run chart-testing (list-changed)
         id: list-changed