fix: Settings: Define encoding when calling open()

gajim/common/settings.py

@@ -225,7 +225,7 @@ def _load_app_overrides(self) -> None:
         if not OVERRIDES_PATH.exists():
             return
 
-        with OVERRIDES_PATH.open() as f:
+        with OVERRIDES_PATH.open(encoding='utf8') as f:
             try:
                 self._app_overrides = json.load(f)
             except Exception: