chore(deps): Bump helm/chart-testing-action from 2.4.0 to 2.6.0 (#172)

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.4.0 to 2.6.0.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@e878887...b43128a)

---
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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ct-lint.yaml

@@ -28,7 +28,7 @@ jobs:
         with:
           python-version: 3.7
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@e8788873172cb653a90ca2e819d79d65a66d4e76 # v2.4.0
+        uses: helm/chart-testing-action@b43128a8b25298e1e7b043b78ea6613844e079b1 # v2.6.0
       - name: Run chart-testing (lint)
         run: |
           set -e