Voice gateway check_keepalive_timer should not be info.

[vicky5124]

Oct 05 02:00:02.897  INFO runner:cycle{audio_timer=Timer { due: Instant { tv_sec: 380422, tv_nsec: 914797033 }, duration: 20ms } bitrate=BitsPerSecond(128000) muted=false}:check_keepalive_timer: serenity::voice::connection: [Voice] WS keepalive
Oct 05 02:00:02.898  INFO runner:cycle{audio_timer=Timer { due: Instant { tv_sec: 380422, tv_nsec: 914797033 }, duration: 20ms } bitrate=BitsPerSecond(128000) muted=false}:check_keepalive_timer: serenity::voice::connection: [Voice] WS keepalive sent
Oct 05 02:00:02.957  INFO runner:cycle{audio_timer=Timer { due: Instant { tv_sec: 380422, tv_nsec: 974797033 }, duration: 20ms } bitrate=BitsPerSecond(128000) muted=false}: serenity::voice::connection: [Voice] Heartbeat ACK received.
Oct 05 02:00:44.137  INFO runner:cycle{audio_timer=Timer { due: Instant { tv_sec: 380464, tv_nsec: 154797033 }, duration: 20ms } bitrate=BitsPerSecond(128000) muted=false}:check_keepalive_timer: serenity::voice::connection: [Voice] WS keepalive
Oct 05 02:00:44.137  INFO runner:cycle{audio_timer=Timer { due: Instant { tv_sec: 380464, tv_nsec: 154797033 }, duration: 20ms } bitrate=BitsPerSecond(128000) muted=false}:check_keepalive_timer: serenity::voice::connection: [Voice] WS keepalive sent
Oct 05 02:00:44.197  INFO runner:cycle{audio_timer=Timer { due: Instant { tv_sec: 380464, tv_nsec: 214797033 }, duration: 20ms } bitrate=BitsPerSecond(128000) muted=false}: serenity::voice::connection: [Voice] Heartbeat ACK received.

this gets very easily spammed on the logs, even on high logging levels. the logging level should be switched to trace as the main gateway one.

[kangalio]

The code in question doesn't exist anymore (the whole voice module is gone), so this issue can probably be closed?