Update Spigot revision

This appears to compile, but will need testing before a release. Spigot removed the renames they used to apply to all internal classes.

Author: Jikoo

internal/spigot/build.gradle.kts

@@ -10,7 +10,7 @@ plugins {
 apply<SpigotSetup>()
 apply<SpigotReobf>()
 
-val spigotVer = "1.21.11-R0.1-SNAPSHOT"
+val spigotVer = "1.21.11-R0.2-SNAPSHOT"
 // Used by common adapter to relocate Craftbukkit classes to a versioned package.
 rootProject.extra["craftbukkitPackage"] = "v1_21_R7"