Fix typing for py39

src/commands/audio.py

@@ -6,6 +6,8 @@ import random
 import time
 import yt_dlp
 
+from typing import Optional
+
 from commands.command import Command
 
 # Taken from https://github.com/Rapptz/discord.py/blob/master/examples/basic_voice.py
@@ -32,7 +34,7 @@ ffmpeg_options = {
 
 ytdl = yt_dlp.YoutubeDL(ytdl_format_options)
 
-def get_channel_connection(connections: list, channel_id: int) -> dict | None:
+def get_channel_connection(connections: list, channel_id: int) -> Optional[dict]:
     for connection in connections:
         if connection['id'] == channel_id:
             return connection