cleaned up some unused imports

src/main/java/net/hexa/MythicItems/Mythics/Constants.java

@@ -1,6 +1,5 @@
 package net.hexa.MythicItems.Mythics;
 
-import net.hexa.MythicItems.MythicItems;
 import org.bukkit.Bukkit;
 import org.bukkit.NamespacedKey;
 import org.bukkit.plugin.Plugin;

src/main/java/net/hexa/MythicItems/Mythics/RockCracker.java

@@ -4,7 +4,6 @@ import org.bukkit.Material;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
-import org.bukkit.persistence.PersistentDataType;
 
 import java.util.Arrays;