1.21.3 (#2974)

* feat: initial work on 1.21.3 adapter

* chore: method does not exist anymore

* cleanup, deduplicate, drop old versions from runServer task

* chore: apply deduplicated fields changes from PR

* chore: remove jetbrains annotations references

* chore: remove unsupported versions from modrinth release task

* chore: adjust mondrinth versions, update issue template

worldedit-bukkit/adapters/adapter-1_21_3/build.gradle.kts

@@ -0,0 +1,17 @@
+import io.papermc.paperweight.userdev.PaperweightUserDependenciesExtension
+
+plugins {
+    java
+}
+
+applyPaperweightAdapterConfiguration()
+
+repositories {
+    gradlePluginPortal()
+}
+
+dependencies {
+    // url=https://repo.papermc.io/service/rest/repository/browse/maven-public/io/papermc/paper/dev-bundle/1.21.3-R0.1-SNAPSHOT/
+    the<PaperweightUserDependenciesExtension>().paperDevBundle("1.21.3-R0.1-20241101.150401-13")
+    compileOnly(libs.paperlib)
+}