⬆ Update plugin org.jetbrains.kotlin.jvm to v2.0.21 (#115)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-  kotlin("jvm") version "2.0.20"
+  kotlin("jvm") version "2.0.21"
   `maven-publish`
   signing
   id("org.jetbrains.dokka") version "1.9.20"