Set the JVM version in the "plugins" project to 8

Author: ShreckYe

gradle-plugins/build.gradle.kts

@@ -6,6 +6,8 @@ plugins {
     id("com.gradle.plugin-publish") version "1.2.1"
 }
 
+kotlin.jvmToolchain(8)
+
 repositories {
     mavenCentral()
 }