Attempt to fix windows test

manim/_config/__init__.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import logging
+import os
 from contextlib import contextmanager
 from typing import Any, Generator
 
@@ -20,6 +21,8 @@ __all__ = [
     "cli_ctx_settings",
 ]
 
+os.environ["PYTHONIOENCODING"] = "utf-8"
+
 parser = make_config_parser()
 
 # The logger can be accessed from anywhere as manim.logger, or as