[CI/Build] Fix Bad Import In Test (#3473)

tests/test_cache_block_hashing.py

@@ -7,7 +7,7 @@
 import pytest
 
 from vllm.lora.request import LoRARequest
-from vllm.transformers_utils.tokenizer import TokenizerGroup
+from vllm.transformers_utils.tokenizer_group import TokenizerGroup
 from vllm.sequence import Sequence
 
 # Make two prefixes with different first blocks.