fix: use dict sampling params in prefill warmup (#7797)

Co-authored-by: Weiliangl User <weiliangl@login-node.hosted.internal>

components/src/dynamo/sglang/init_llm.py

@@ -29,13 +29,12 @@ async def _warmup_prefill_engine(engine: sgl.Engine, server_args) -> None:
     logging.info("Start of prefill disaggregation warmup ...")
     try:
         from sglang.srt.disaggregation.utils import FAKE_BOOTSTRAP_HOST
-        from sglang.srt.sampling.sampling_params import SamplingParams
 
-        sampling_params = SamplingParams(
-            temperature=0.0,
-            max_new_tokens=8,
-            ignore_eos=True,
-        )
+        sampling_params = {
+            "temperature": 0.0,
+            "max_new_tokens": 8,
+            "ignore_eos": True,
+        }
 
         async def _do_warmup():
             results = await engine.async_generate(