Updates the metadata of the credential without checking the token again. The request body is a JSON object of metadata keys. Keys you send replace the stored value, keys you leave out are kept, and a key sent as null is ignored. Keys for GitHub: orgName (string, cannot be changed), allowedRepos (array of owner/repo strings, at most 200), enterpriseSlug (string), claudeCoAuthorPatterns (array of strings), codingAssistantCoAuthorPatterns (object of string arrays keyed by coding assistant). Keys for GitLab: groupPath (string), instanceUrl (string, http or https URL), allowedProjects (array of group/project strings, at most 200), claudeCoAuthorPatterns and codingAssistantCoAuthorPatterns as for GitHub. Each co-author pattern list holds at most 20 strings of at least 3 characters.