fix(core): adds 'none' token endpoint auth method for oauth and oidc (#12066)

Author: JonnyBGod

packages/core/src/lib/actions/callback/oauth/callback.ts

@@ -118,6 +118,9 @@ export async function handleOAuth(
         },
       })
       break
+    case "none":
+      clientAuth = o.None()
+      break
     default:
       throw new Error("unsupported client authentication method")
   }