[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

applications/ColossalChat/coati/distributed/grpo_consumer.py

@@ -1,5 +1,5 @@
 from contextlib import nullcontext
-from typing import Any, Dict, Optional
+from typing import Any, Optional
 
 import ray
 import torch