updated to Paper 26.2, Java 25 and Gradle 9.6.1

- paper-api 26.2.build.129-stable (all modules), Java toolchain 25, shadow 9.6.1
- fixed NoSuchFieldError on join/quit/chat: Adventure 5 ClickEvent API
  (ClickEvent.suggestCommand / openUrl instead of ClickEvent.Action constants)
- fixed NBTComponent generics in AntiFormattedBook
- replaced javax.annotation with org.jetbrains.annotations (no longer provided by paper-api)
- local.gradle.example: Gradle 9 compatible (archiveFile, providers.exec)

The previous state is tagged as paper-1.21.10.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

local.gradle.example

@@ -1,6 +1,6 @@
 tasks.register('deployVaroPlugin', Copy) {
     dependsOn ":varo:shadowJar"
-    from { project(":varo").shadowJar.archivePath }
+    from { project(":varo").shadowJar.archiveFile }
     into file('path') // path to plugins folder
     rename { fileName -> "varo.jar" }
 }
@@ -10,15 +10,15 @@ tasks.register("uploadVaroPlugin") {
 
     doLast {
         def jarFile = project(":varo").tasks.named("shadowJar").get().outputs.files.singleFile
-        exec {
+        providers.exec {
             commandLine "scp", "-4", "-P", "22", jarFile.absolutePath, "user@host:path/varo.jar"
-        }
+        }.result.get()
     }
 }
 
 tasks.register('deployCraftAttackPlugin', Copy) {
     dependsOn ":craftattack:shadowJar"
-    from { project(":craftattack").shadowJar.archivePath }
+    from { project(":craftattack").shadowJar.archiveFile }
     into file('path') // path to plugins folder
     rename { fileName -> "craftattack.jar" }
 }