fix: use int nonce for heartbeat instead of float for VoiceGateway (#1727)

Fixes #1726
VoiceGateway no longer accepts a string or a float in the heartbeat nonce and instead immediately disconnects the client with code 4020.
Fixed send_heartbeat to use an uint64 instead of a float for the nonce.

Author: SirTurlock

interactions/api/voice/voice_gateway.py

@@ -350,7 +350,7 @@ def send_packet(self, data: bytes, encoder, needs_encode=True) -> None:
         self.timestamp += encoder.samples_per_frame
 
     async def send_heartbeat(self) -> None:
-        await self.send_json({"op": OP.HEARTBEAT, "d": random.uniform(0.0, 1.0)})
+        await self.send_json({"op": OP.HEARTBEAT, "d": random.getrandbits(64)})
         self.logger.debug("❤ Voice Connection is sending Heartbeat")
 
     async def _identify(self) -> None: