ci: removing linkage-monitor from the required checks (#529)
ci: removing linkage-monitor from the required checks (#529)

Linkage Monitor is no longer needed, because the Libraries BOM synchronizes with Google Cloud BOM and the shared dependencies BOM https://github.com/GoogleCloudPlatform/cloud-opensource-java/issues/2137
googleapis/google-cloud-java,googleapis/google-cloud-java,googleapis/google-cloud-java