Update helm/chart-testing-action action to v2.7.0 (#77)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/lint-test.yaml

@@ -22,7 +22,7 @@ jobs:
           check-latest: true
 
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.6.1
+        uses: helm/chart-testing-action@v2.7.0
 
       - name: Run chart-testing (list-changed)
         id: list-changed