feat: Added missing music_discs from 1.21.6 & 1.21.7 (#4694)

Added missing music_discs from 1.21.6 & 1.21.7

Author: jvstinxz

Core/src/main/java/com/plotsquared/core/command/Music.java

@@ -57,7 +57,7 @@ public class Music extends SubCommand {
                     "music_disc_far", "music_disc_mall", "music_disc_mellohi", "music_disc_stal",
                     "music_disc_strad", "music_disc_ward", "music_disc_11", "music_disc_wait", "music_disc_otherside",
                     "music_disc_pigstep", "music_disc_5", "music_disc_relic", "music_disc_creator",
-                    "music_disc_creator_music_box", "music_disc_precipice"
+                    "music_disc_creator_music_box", "music_disc_precipice", "music_disc_tears", "music_disc_lava_chicken"
             );
 
     // make sure all discs and the bedrock ("cancel") fit into the inventory