[Release] Update flagtree version to v0.4.0 on triton_v3.3.x branch (#282)

Author: zhzhcookie

python/setup.py

@@ -785,7 +785,7 @@ def get_git_version_suffix():
 
 setup(
     name=os.environ.get("FLAGTREE_WHEEL_NAME", "flagtree"),
-    version="0.3.0" + os.environ.get("FLAGTREE_WHEEL_VERSION_SUFFIX", ""),
+    version="0.4.0" + os.environ.get("FLAGTREE_WHEEL_VERSION_SUFFIX", ""),
     author="FlagOS",
     author_email="contact@flagos.io",
     description=