chore: update the gpu_memory_utilization to 0.8 for ci tests

Signed-off-by: Jade Zheng <[email protected]>

Author: jianzs

tests/singlecard/spec_decode/e2e/test_mtp_correctness.py

@@ -78,7 +78,7 @@
         "model_name": FLOAT_MODEL,
 
         # GPU memory utilization
-        "gpu_memory_utilization": 0.85
+        "gpu_memory_utilization": 0.8
     }])
 @pytest.mark.parametrize("per_test_common_llm_kwargs", [{}])
 @pytest.mark.parametrize("baseline_llm_kwargs", [{}])