thnx copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: sungwy

pyiceberg/catalog/rest/__init__.py

@@ -256,10 +256,10 @@ def _create_session(self) -> Session:
             auth_type_config = auth_config.get(auth_type, {})
             auth_impl = auth_config.get("impl")
 
-            if auth_type is CUSTOM and not auth_impl:
+            if auth_type == CUSTOM and not auth_impl:
                 raise ValueError("auth.impl must be specified when using custom auth.type")
 
-            if auth_type is not CUSTOM and auth_impl:
+            if auth_type != CUSTOM and auth_impl:
                 raise ValueError("auth.impl can only be specified when using custom auth.type")
 
             session.auth = AuthManagerAdapter(AuthManagerFactory.create(auth_impl or auth_type, auth_type_config))