build(deps): ⬆️ Update plugin org.jetbrains.kotlin.jvm to v2.1.21

Author: renovate[bot]

build.gradle.kts

@@ -3,7 +3,7 @@ import java.net.URI
 
 plugins {
     application
-    kotlin("jvm") version "2.1.20"
+    kotlin("jvm") version "2.1.21"
     id("com.github.johnrengelman.shadow") version "8.1.1"
     kotlin("plugin.serialization") version "2.1.20"
     id("maven-publish")