[Misc] Limit to ray[adag] 2.35 to avoid backward incompatible change (#8509)

Signed-off-by: Rui Qiao <ruisearch42@gmail.com>

requirements-test.txt

@@ -14,7 +14,7 @@ librosa # required for audio test
 opencv-python # required for video test
 peft
 requests
-ray[adag]>=2.35
+ray[adag]==2.35
 sentence-transformers # required for embedding
 soundfile # required for audio test
 compressed-tensors==0.4.0 # required for compressed-tensors

vllm/executor/ray_gpu_executor.py

@@ -437,8 +437,10 @@ class RayGPUExecutor(DistributedGPUExecutor):
         required_version = version.parse("2.35")
         current_version = version.parse(
             pkg_resources.get_distribution("ray").version)
-        if current_version < required_version:
-            raise ValueError(f"Ray version {required_version} or greater is "
+        # TODO: update the constraint once we adapt to the backward
+        # incompatible API change from ray 2.36
+        if current_version != required_version:
+            raise ValueError(f"Ray version {required_version} is "
                              f"required, but found {current_version}")
 
         import importlib.util