Update plugin org.jetbrains.kotlin.jvm to v1.8.20 (#13)

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

Author: renovate[bot]

build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-  id("org.jetbrains.kotlin.jvm") version "1.8.10"
+  id("org.jetbrains.kotlin.jvm") version "1.8.20"
   id("io.github.gradle-nexus.publish-plugin") version "1.1.0"
   id("org.jetbrains.dokka") version "1.7.20"
   `java-library`