fix: update the unit test err_console

Author: eureka928

tests/unit_tests/test_subnets_register.py

@@ -90,7 +90,7 @@ async def test_register_subnet_does_not_exist(
         mock_subtensor_base.subnet_exists = AsyncMock(return_value=False)
 
         with patch(
-            "bittensor_cli.src.commands.subnets.subnets.err_console"
+            "bittensor_cli.src.bittensor.utils.err_console"
         ) as mock_err_console:
             result = await register(
                 wallet=mock_wallet,