chore(deps): update plugin org.jetbrains.kotlin.jvm to v2.1.21 (#53)

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

Author: renovate[bot]

build.gradle.kts

@@ -3,7 +3,7 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "2.1.20"
+    kotlin("jvm") version "2.1.21"
     id("org.jetbrains.dokka") version "2.0.0"
     id("io.github.goooler.shadow") version "8.1.8"