Avoid leaving the init finalizer around

Author: ncoghlan

src/lmstudio/_ws_impl.py

@@ -288,7 +288,15 @@ def call_in_background(self, func: Callable[[], Any]) -> None:
 # Creating this finalizer here ensures the weakref finalization hook is
 # registered at import time, and hence runs *after* any such hooks
 # (assuming the lmstudio SDK is imported before the hooks are registered)
-weakref.finalize(list, int)
+def _register_weakref_atexit_hook() -> None:
+    class C:
+        pass
+
+    weakref.finalize(C(), int)
+
+
+_register_weakref_atexit_hook()
+del _register_weakref_atexit_hook
 
 
 class AsyncWebsocketThread(BackgroundThread):