added pre1 to 1.21 achives

Libraries/Versions/Pre-Release/1.21-pre1.md

@@ -2,6 +2,7 @@
 version-image-link: https://s21.ax1x.com/2024/05/30/pk3w4JO.jpg
 server-jar: https://piston-data.mojang.com/v1/objects/57e59ee5d8bc6ce664a7d76de45f8df9c110381f/server.jar
 translator: 最亮的信标
+cats: ['1.21']
 ---
 ## 新特性
 ### 不祥试炼刷怪笼