chore(deps): 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] <[email protected]>

.github/workflows/helm.yaml

@@ -20,7 +20,7 @@ jobs:
           python-version: 3.7
 
       - name: set up chart-testing
-        uses: helm/chart-testing-action@v2.4.0
+        uses: helm/chart-testing-action@v2.6.1
 
       - name: run chart-testing (lint)
         run: ct lint --all