fix costumes are unable to be unlocked. (#1842)

* fix: costumes are able to be unlocked.

* Update AvatarCostumeData

src/main/java/emu/grasscutter/data/excels/AvatarCostumeData.java

 package emu.grasscutter.data.excels;
 
+import com.google.gson.annotations.SerializedName;
 import emu.grasscutter.data.GameData;
 import emu.grasscutter.data.GameResource;
 import emu.grasscutter.data.ResourceType;
 
 @ResourceType(name = "AvatarCostumeExcelConfigData.json")
 public class AvatarCostumeData extends GameResource {
-    private int costumeId;
+    @SerializedName(value = "skinId", alternate = "costumeId")
+    private int skinId;
     private int itemId;
     private int characterId;
     private int quality;
 
     @Override
     public int getId() {
-        return this.costumeId;
+        return this.skinId;
     }
 
     public int getItemId() {