chore(deps): bump helm/chart-testing-action from 2.1.0 to 2.6.1

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.1.0 to 2.6.1.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@5f16c27...e6669bc)

---
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/lint.yml

@@ -52,6 +52,6 @@ jobs:
         with:
           python-version: 3.7
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@5f16c27cf7a4fa9c776ff73734df3909b2b65127 # v2.1.0
+        uses: helm/chart-testing-action@e6669bcd63d7cb57cb4380c33043eebe5d111992 # v2.6.1
       - name: Lint chart
         run: ct lint --charts ./chart