Use vllm directly from upstream latest to pick up vllm-project/vllm#2316

vllm-online-serving/requirements.txt

@@ -1,3 +1,3 @@
 aioprometheus==23.12.0
 fastapi==0.109.2
-vllm==0.3.0
+vllm @ git+https://github.com/vllm-project/vllm@c9b45adeeb0e5b2f597d1687e0b8f24167602395