Rewrite based on code from the GitHub Dependency Graph Gradle Plugin

fixtures/buildsrc/plugin-in-buildsrc/kotlin/build.gradle.kts

@@ -1,4 +1,4 @@
 plugins {
     `java-library`
-    id("com.example.custom-spotless")
-}
+    id("com.example.apply-plugin-publish")
+}

fixtures/buildsrc/plugin-in-buildsrc/kotlin/buildSrc/build.gradle.kts

@@ -3,10 +3,9 @@ plugins {
 }
 
 repositories {
-    jcenter()
     gradlePluginPortal()
 }
 
 dependencies {
-    implementation("com.diffplug.spotless:spotless-plugin-gradle:3.28.1")
+    implementation("com.gradle.publish:plugin-publish-plugin:1.2.1")
 }

fixtures/buildsrc/plugin-in-buildsrc/kotlin/buildSrc/src/main/kotlin/com.example/apply-plugin-publish.gradle.kts

@@ -0,0 +1,5 @@
+package com.example
+
+plugins {
+    id("com.gradle.plugin-publish")
+}

fixtures/buildsrc/plugin-in-buildsrc/kotlin/buildSrc/src/main/kotlin/com.example/custom-spotless.gradle.kts

@@ -1,11 +0,0 @@
-package com.example
-
-plugins {
-    com.diffplug.gradle.spotless
-}
-
-spotless {
-    kotlin {
-        ktlint()
-    }
-}