Bump helm/chart-testing-action from 2.6.1 to 2.7.0 (#282)

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.6.1 to 2.7.0.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v2.6.1...v2.7.0)

---
updated-dependencies:
- dependency-name: helm/chart-testing-action
  dependency-version: 2.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/publish-chart.yml

@@ -39,7 +39,7 @@ jobs:
           python-version: 3.13
       - name: Setup Chart Linting
         id: lint
-        uses: helm/chart-testing-action@v2.6.1
+        uses: helm/chart-testing-action@v2.7.0
       - name: Run chart-testing
         run: ct lint --validate-maintainers=false --charts ${{ env.CHART_DIR }}
   publish:

.github/workflows/test-chart.yml

@@ -39,6 +39,6 @@ jobs:
           python-version: 3.13
       - name: Setup Chart Linting
         id: lint
-        uses: helm/chart-testing-action@v2.6.1
+        uses: helm/chart-testing-action@v2.7.0
       - name: Run chart-testing
         run: ct lint --validate-maintainers=false --charts ${{ env.CHART_DIR }}