gradlew

A couple of important bug fixes affecting Scala compilation are the main driver:
* https://github.com/gradle/gradle/issues/13224
* https://github.com/gradle/gradle/issues/13392

Full release notes for the other improvements:
* https://docs.gradle.org/6.6/release-notes.html

Reviewers: Manikumar Reddy <manikumar.reddy@gmail.com>