fix(voice): avoid bitwise overflow error

[james58899]

JavaScript converts operands to 32-bit signed int before doing bitwise operations.

Fix crash:

node:internal/buffer:72
    throw new ERR_OUT_OF_RANGE('value', range, value);
    ^

RangeError [ERR_OUT_OF_RANGE]: The value of "value" is out of range. It must be >= 0 and <= 4294967295. Received -2147482816
    at new NodeError (node:internal/errors:371:5)
    at checkInt (node:internal/buffer:72:11)
    at writeU_Int32BE (node:internal/buffer:802:3)
    at Buffer.writeUInt32BE (node:internal/buffer:815:10)
    at VoiceConnection._sendAudioFrame (/home/james58899/MusicBot/node_modules/eris/lib/voice/VoiceConnection.js:807:24)
    at VoiceConnection.sendAudioFrame (/home/james58899/MusicBot/node_modules/eris/lib/voice/VoiceConnection.js:647:21)
    at VoiceConnection._send (/home/james58899/MusicBot/node_modules/eris/lib/voice/VoiceConnection.js:800:14)
    at listOnTimeout (node:internal/timers:557:17)
    at processTimers (node:internal/timers:500:7) {
  code: 'ERR_OUT_OF_RANGE'
}

[abalabahaha]

Someone was writing too much C for school... thanks