Update plugin org.jetbrains.kotlin.jvm to v1.9.20

Author: renovate[bot]

build.gradle.kts

@@ -2,7 +2,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
     // Apply the Kotlin JVM plugin to add support for Kotlin.
-    kotlin("jvm") version "1.6.0"
+    kotlin("jvm") version "1.9.20"
     id("com.github.johnrengelman.shadow") version "7.1.2"
     id("org.jetbrains.dokka") version "1.5.31"
     kotlin("plugin.serialization") version "1.4.21"