fix: test don't use async

Author: adamsaimi

tests/issues/test_783_mount_path_sse_message.py

@@ -4,7 +4,7 @@
 
 
 @pytest.mark.parametrize("mount_path", ["/sse", "/custom/mount/path", None])
-async def test_mount_path_included_in_sse_message_path(mount_path):
+def test_mount_path_included_in_sse_message_path(mount_path):
     """Test that the mount path is included in the SSE message path when specified."""
     app = FastMCP("Test App")
     starlette_app = app.sse_app(mount_path)