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](helm/chart-testing-action@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>

.github/workflows/call-lint-chart.yaml

@@ -74,7 +74,7 @@ jobs:
       # Pre-requisites: A GitHub repo containing a directory with your Helm charts (e.g: charts)
       - name: Set up chart-testing
         if: ${{ env.RUN_JUST_LINT_CHART == 'false' }}
-        uses: helm/chart-testing-action@v2.3.1
+        uses: helm/chart-testing-action@v2.6.1
 
       - name: Run chart-testing (list-changed)
         if: ${{ env.RUN_JUST_LINT_CHART == 'false' }}