When an external repository reaches IO error or generates network timeouts the build fails in resolving external dependencies (plugins or libraries used by the project).
This commits increase a little bit those limits.
* Update gradle version to 6.3
Gradle versions prior to 6.3 cannot run under JDK14.
This commit upgrades the version of Gradle to 6.3, and removes all deprecation warnings that can currently be removed.
Changes include:
* Increase gradle memory to 2g
* Increase gradle memory in the license check job to 2g
* Replace use of `testCompile`
* Replace `runtime` with `runtimeOnly`
* Remove`compile` depedencies from gradle files
* Replace deprecated archive methods
* Fix dependencies report build
* Make jruby dependencies 'api', fix archiveVersion
* Set `duplicatesStrategy` for all tasks of type Copy
* Use `configureEach` for global 'withType' calls
** Use the recommended Tasks API calls
(https://blog.gradle.org/preview-avoiding-task-configuration-time)
* Run `./gradlew wrapper` earlier to improve caching
* Use copy with chown for resources that need to be run during `./gradlew wrapper`
