Temporarily force `build-platform` to use Kotlin `1.5.21`
Temporarily force `build-platform` to use Kotlin `1.5.21`

For compatibility with the published `kotlin-dsl` plugin.

blindpirate/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,blindpirate/gradle,blindpirate/gradle,blindpirate/gradle,gradle/gradle,gradle/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,gradle/gradle,blindpirate/gradle,gradle/gradle,gradle/gradle,gradle/gradle