chore: update adapter to new spec

Author: PierreSchwang

worldedit-bukkit/adapters/adapter-1_21_9/build.gradle.kts

@@ -1,17 +1,11 @@
 import io.papermc.paperweight.userdev.PaperweightUserDependenciesExtension
 
 plugins {
-    java
-}
-
-applyPaperweightAdapterConfiguration()
-
-repositories {
-    gradlePluginPortal()
+    id("buildlogic.adapter")
 }
 
 dependencies {
     // https://repo.papermc.io/service/rest/repository/browse/maven-public/io/papermc/paper/dev-bundle/
     the<PaperweightUserDependenciesExtension>().paperDevBundle("1.21.10-R0.1-20251007.183616-3")
-    compileOnly(libs.paperlib)
+    compileOnly(libs.paperLib)
 }