Bump helm/chart-testing-action from 2.4.0 to 2.6.1 (#169)

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.4.0 to 2.6.1.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v2.4.0...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -25,7 +25,7 @@ jobs:
         with:
           python-version: 3.7
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.4.0
+        uses: helm/chart-testing-action@v2.6.1
       - name: Run chart-testing (lint)
         run: ct lint --config .github/ct.yaml
 
@@ -96,7 +96,7 @@ jobs:
         with:
           python-version: 3.7
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.4.0
+        uses: helm/chart-testing-action@v2.6.1
       - name: Run chart-testing (list-changed)
         id: list-changed
         run: if [[ -n "$(ct list-changed --config .github/ct.yaml)" ]]; then echo 'changed=true' >> "$GITHUB_OUTPUT"; fi