better-abstract the GitHub integration implementation

Author: tayloraswift

Sources/UnidocServer/GitHub.Client.Connection (ext).swift

@@ -3,11 +3,10 @@ import GitHubAPI
 extension GitHub
 {
     public
-    protocol Integration:AnyObject, Sendable
+    protocol Integration:Unidoc.Registrar
     {
         var agent:String { get }
         var oauth:OAuth { get }
-
         var pat:PersonalAccessToken { get }
     }
 }