Bump helm/chart-testing-action from 2.4.0 to 2.6.1

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.4.0 to 2.6.1.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v2.4.0...v2.6.1)

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

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

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

@@ -109,7 +109,7 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Setup chart-testing
-        uses: helm/chart-testing-action@v2.4.0
+        uses: helm/chart-testing-action@v2.6.1
         with:
           version: ${{ env.CHART_TESTING_VERSION }}
 
@@ -151,7 +151,7 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Setup chart-testing
-        uses: helm/chart-testing-action@v2.4.0
+        uses: helm/chart-testing-action@v2.6.1
         with:
           version: ${{ env.CHART_TESTING_VERSION }}