fix mypy

Author: shiinamiyuki

pyproject.toml

@@ -15,3 +15,7 @@ where = ["."]  # list of folders that contain the packages (["."] by default)
 
 [tool.setuptools.package-data]
 luisa_lang = ["py.typed"]
+
+[[tool.mypy.overrides]]
+module = ["luisa_lang"]
+ignore_missing_imports = true