chore(deps): update actions/checkout action to v6#137

stevemcghee merged 3 commits intoGoogleCloudPlatform:mainGoogleCloudPlatform/reliable-app-platforms:mainfrom

renovate-bot:renovate/actions-checkout-6.xrenovate-bot/GoogleCloudPlatform-_-reliable-app-platforms:renovate/actions-checkout-6.xCopy head branch name to clipboard