Remove unnecessary kotlin build lines

build.gradle.kts

@@ -2,7 +2,6 @@ plugins {
     id("com.gradleup.shadow") version "8.3.6" // Import shadow API.
     java // Tell gradle this is a java project.
     eclipse // Import eclipse plugin for IDE integration.
-    kotlin("jvm") version "2.1.21" // Import kotlin jvm plugin for kotlin/java integration.
 }
 
 java {
@@ -72,10 +71,6 @@ tasks.withType<JavaCompile>().configureEach {
     options.isFork = true
 }
 
-kotlin {
-    jvmToolchain(17)
-}
-
 java {
     toolchain {
         languageVersion = JavaLanguageVersion.of(17)