[Infra] - Add import pytest (#5565)

Signed-off-by: qqiao <[email protected]>

Author: EmmaQiaoCh

tests/unittest/llmapi/test_llm_kv_cache_events.py

@@ -1,6 +1,8 @@
 import asyncio
 import time
 
+import pytest
+
 import tensorrt_llm
 from tensorrt_llm._tensorrt_engine import LLM
 from tensorrt_llm._torch.pyexecutor.llm_request import LlmRequest