gateway: bump helm/chart-testing-action from 2.7.0 to 2.8.0#350

dependabot[bot] wants to merge 1 commit intomainapache/infrastructure-actions:mainfrom

dependabot/github_actions/helm/chart-testing-action-2.8.0apache/infrastructure-actions:dependabot/github_actions/helm/chart-testing-action-2.8.0Copy head branch name to clipboard