Migrate gradle tasks configurations

[serpro69]

E.g.

kotlin-faker/buildSrc/src/main/kotlin/Publishing.kt

Line 25 in 22feb92

val sourcesJar by p.tasks.creating(Jar::class) {

will result in a warning from gradle:

w: file:///home/sergio/Projects/personal/kotlin-faker/buildSrc/src/main/kotlin/Publishing.kt:25:31 'creating(KClass<U>, U.() -> Unit): PolymorphicDomainObjectContainerCreatingDelegateProvider<Task!, U>' is deprecated. Use registering instead. See https://docs.gradle.org/current/userguide/task_configuration_avoidance.html for more information.

https://docs.gradle.org/current/userguide/task_configuration_avoidance.html