chore(deps): bump helm/chart-testing-action from 2.3.1 to 2.6.1 (#2849)

* chore(deps): bump helm/chart-testing-action from 2.3.1 to 2.6.1

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.3.1 to 2.6.1.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](https://github.com/helm/chart-testing-action/compare/v2.3.1...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>

* chore: remove comment regarding upstream issue

Signed-off-by: Moritz Johner <beller.moritz@googlemail.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Moritz Johner <beller.moritz@googlemail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Moritz Johner <beller.moritz@googlemail.com>

.github/workflows/helm.yml

@@ -36,9 +36,7 @@ jobs:
           python-version: 3.7
 
       - name: Set up chart-testing
-        # before upgrading, please see if this has been fixed:
-        # https://github.com/helm/chart-testing-action/issues/132
-        uses: helm/chart-testing-action@v2.3.1
+        uses: helm/chart-testing-action@v2.6.1
 
       - name: Run chart-testing (list-changed)
         id: list-changed