[TOOLS] Continue raising PHPStan level to 6

plugins/OAuth2/Repository/RefreshToken.php

@@ -45,11 +45,17 @@ class RefreshToken implements RefreshTokenRepositoryInterface
         DB::persist($refreshTokenEntity);
     }
 
+    /**
+     * @param string $tokenId
+     */
     public function revokeRefreshToken($tokenId)
     {
         // Some logic to revoke the auth token in a database
     }
 
+    /**
+     * @param string $tokenId
+     */
     public function isRefreshtokenRevoked($tokenId): bool
     {
         return false; // The auth token has not been revoked