🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

google-cloud-license_manager/.repo-metadata.json

@@ -8,7 +8,7 @@
     "name": "licensemanager",
     "name_pretty": "License Manager API",
     "product_documentation": "https://cloud.google.com/compute/docs/instances/windows/ms-licensing",
-    "release_level": "preview",
+    "release_level": "stable",
     "repo": "googleapis/google-cloud-ruby",
     "requires_billing": true,
     "ruby-cloud-description": "License Manager is a tool to manage and track third-party licenses on Google Cloud.",