[CI] Fix tpu worker test (#1124)

Author: kyuyeunk

tests/worker/tpu_worker_test.py

@@ -25,6 +25,8 @@ def mock_vllm_config():
     mock_parallel_conf = MagicMock()
     mock_parallel_conf.tensor_parallel_size = 2
     mock_parallel_conf.data_parallel_size = 1
+    mock_parallel_conf.nnodes = 1
+    mock_parallel_conf.nnodes_within_dp = 1
 
     mock_additional_config = {}