feat(minecraft): update to 1.21.6-rc1

Adds a trigger that was missed in a previous version.

See: https://minecraft.wiki/w/Java_Edition_1.21.6_Release_Candidate_1

Author: gabizou

src/main/java/org/spongepowered/api/advancement/criteria/trigger/Triggers.java

@@ -116,6 +116,8 @@ public final class Triggers {
 
     public static final DefaultedRegistryReference<Trigger<?>> PLAYER_KILLED_ENTITY = Triggers.key(ResourceKey.minecraft("player_killed_entity"));
 
+    public static final DefaultedRegistryReference<Trigger<?>> PLAYER_SHEARED_EQUIPMENT = Triggers.key(ResourceKey.minecraft("player_sheared_equipment"));
+
     public static final DefaultedRegistryReference<Trigger<?>> RECIPE_CRAFTED = Triggers.key(ResourceKey.minecraft("recipe_crafted"));
 
     public static final DefaultedRegistryReference<Trigger<?>> RECIPE_UNLOCKED = Triggers.key(ResourceKey.minecraft("recipe_unlocked"));