build(deps): bump helm/chart-testing-action from 2.6.0 to 2.6.1

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v2.6.0...v2.6.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/helm-lint.yaml

@@ -40,7 +40,7 @@ jobs:
           python-version: 3.9
 
       - name: Set up chart-testing
-        uses: helm/[email protected].0
+        uses: helm/[email protected].1
 
       - name: Run chart-testing (lint)
         run: ct lint --charts=./deploy/charts/rook-ceph --validate-yaml=false --validate-maintainers=false