Bump helm/chart-testing-action from 2.6.1 to 2.7.0 (vllm-project#12463)

Author: dependabot[bot]

.github/workflows/lint-and-deploy.yaml

@@ -22,7 +22,7 @@ jobs:
           python-version: '3.13'
 
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@e6669bcd63d7cb57cb4380c33043eebe5d111992 # v2.6.1
+        uses: helm/chart-testing-action@0d28d3144d3a25ea2cc349d6e59901c4ff469b3b # v2.7.0
         with:
           version: v3.10.1