buildSrc/build.gradle.kts

plugins {
    `kotlin-dsl`
}

repositories {
    gradlePluginPortal() // so that external plugins can be resolved in dependencies section
    mavenCentral()
}

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.21")
}

kotlin {
    jvmToolchain(8)
}