Updated bukkit platform to 1.21

platforms/bukkit/nms/v1_21/build.gradle.kts

@@ -0,0 +1,17 @@
+apply(plugin = "io.papermc.paperweight.userdev")
+
+repositories {
+    maven("https://s01.oss.sonatype.org/content/repositories/snapshots/")
+}
+
+dependencies {
+    api(project(":platforms:bukkit:common"))
+    paperDevBundle(Versions.Bukkit.paperDevBundle)
+    implementation("xyz.jpenilla", "reflection-remapper", Versions.Bukkit.reflectionRemapper)
+}
+
+tasks {
+    assemble {
+        dependsOn("reobfJar")
+    }
+}