Bump helm/chart-testing-action from 2.7.0 to 2.8.0

Bumps [helm/chart-testing-action](https://github.com/helm/chart-testing-action) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/helm/chart-testing-action/releases)
- [Commits](helm/chart-testing-action@v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: helm/chart-testing-action
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-cd.yaml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.7.0
+        uses: helm/chart-testing-action@v2.8.0
       - name: Lint charts
         run: ct lint --charts=charts/trino,charts/gateway --validate-maintainers=false
 
@@ -78,7 +78,7 @@ jobs:
         with:
           version: v3.19.0
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.7.0
+        uses: helm/chart-testing-action@v2.8.0
       - name: Create kind cluster
         uses: helm/[email protected]
         with:
@@ -103,7 +103,7 @@ jobs:
         with:
           version: v3.19.0
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.7.0
+        uses: helm/chart-testing-action@v2.8.0
       - name: Create kind cluster
         uses: helm/[email protected]
         with: