[CI] fix possible port conflicts. (#12452)

Co-authored-by: Lianmin Zheng <15100009+merrymercy@users.noreply.github.com>

python/sglang/test/test_utils.py

@@ -151,7 +151,7 @@ def _use_cached_default_models(model_repo: str):
 
 if is_in_ci():
     DEFAULT_PORT_FOR_SRT_TEST_RUNNER = (
-        10000 + int(os.environ.get("CUDA_VISIBLE_DEVICES", "0")[0]) * 1000
+        10000 + int(os.environ.get("CUDA_VISIBLE_DEVICES", "0")[0]) * 2000
     )
 else:
     DEFAULT_PORT_FOR_SRT_TEST_RUNNER = (