Fix jukebox_playable backup

Fixes #1130

Author: kennytv

common/src/main/java/com/viaversion/viabackwards/protocol/v1_21to1_20_5/rewriter/BlockItemPacketRewriter1_21.java

@@ -324,7 +324,7 @@ private void restoreInconvertibleData(final Item item) {
  if (songIdentifier != null) {
  song = EitherHolder.of(songIdentifier);
  } else {
- song = EitherHolder.of(restoreHolder(tag, "song", songTag -> {
+ song = EitherHolder.of(restoreHolder(jukeboxPlayableTag, "song", songTag -> {
  final Holder<SoundEvent> soundEvent = restoreSoundEventHolder(songTag);
  final Tag description = songTag.get("description");
  final float lengthInSeconds = songTag.getFloat("length_in_seconds");

gradle/libs.versions.toml

@@ -16,7 +16,7 @@ checkerQual = "3.51.0"
 paper = "1.16.5-R0.1-SNAPSHOT"
 velocity = "3.1.1"
 fabricLoader = "0.11.6"
-viaProxy = "3.4.6-SNAPSHOT"
+viaProxy = "3.4.7-SNAPSHOT"
 
 [libraries]