Update flashinfer to 0.3.1 for B300 support (#10087)

Signed-off-by: Hao Lu <14827759+hlu1@users.noreply.github.com>

python/pyproject.toml

@@ -63,7 +63,7 @@ srt = [
     "torchaudio==2.8.0",
     "torchvision",
     "cuda-python",
-    "flashinfer_python==0.3.0",
+    "flashinfer_python==0.3.1",
 ]
 
 blackwell = [
@@ -73,7 +73,7 @@ blackwell = [
     "torchaudio==2.8.0",
     "torchvision",
     "cuda-python",
-    "flashinfer_python==0.3.0",
+    "flashinfer_python==0.3.1",
 ]
 
 # HIP (Heterogeneous-computing Interface for Portability) for AMD

python/sglang/srt/entrypoints/engine.py

@@ -673,7 +673,7 @@ def _set_envs_and_config(server_args: ServerArgs):
     if server_args.attention_backend == "flashinfer":
         assert_pkg_version(
             "flashinfer_python",
-            "0.3.0",
+            "0.3.1",
             "Please uninstall the old version and "
             "reinstall the latest version by following the instructions "
             "at https://docs.flashinfer.ai/installation.html.",