Remove some unused imports

src/backend/nio_callbacks.py

@@ -1,7 +1,6 @@
 # Copyright Mirage authors & contributors <https://github.com/mirukana/mirage>
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
-import asyncio
 import json
 import logging as log
 from dataclasses import dataclass, field

src/backend/presence.py

@@ -3,7 +3,7 @@
 
 from dataclasses import dataclass, field
 from datetime import datetime
-from typing import TYPE_CHECKING, Any, Dict, Optional
+from typing import TYPE_CHECKING, Dict, Optional
 
 from .utils import AutoStrEnum, auto