feat: bump helm/chart-testing-action from 1.1.0 to 2.6.1

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 1.1.0 to 2.6.1.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v1.1.0...v2.6.1)

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

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

.github/workflows/verify.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Fetch history
         run: git fetch --prune --unshallow
       - name: Run lint
-        uses: helm/chart-testing-action@v1.1.0
+        uses: helm/chart-testing-action@v2.6.1
         with:
           command: lint
           config: .github/verify-config.yaml