[Bugfix] Relax tiktoken to >= 0.6.0 (vllm-project#4890)

requirements-common.txt

@@ -14,7 +14,7 @@ uvicorn[standard]
 pydantic >= 2.0  # Required for OpenAI server.
 prometheus_client >= 0.18.0
 prometheus-fastapi-instrumentator >= 7.0.0
-tiktoken == 0.6.0  # Required for DBRX tokenizer
+tiktoken >= 0.6.0  # Required for DBRX tokenizer
 lm-format-enforcer == 0.10.1
 outlines == 0.0.34 # Requires torch >= 2.1.0
 typing_extensions