fix(voice): don't strip port from voice websocket endpoints

[shiftinv]

Summary

Fixes issues with connecting to voice servers in some regions (seemingly only US and parts of EU?), where Discord has started occasionally using ports other than 443 for voice websockets:

{"t": "VOICE_SERVER_UPDATE", "s": 132, "op": 0, "d": {"token": "...", "guild_id": "...", "endpoint": "c-ams20-20d36bc4.discord.media:2087"}}

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)