Avoid using `compile` configuration to declare dependencies in gradle build scripts

Currently on an exercise build Gradle reports a warning on the topic: `compile` configuration has been marked as deprecated for further removal.

Suppose we should substitute it with `implementation` in *_template*-ed and applied build scripts.

>The compile configuration has been deprecated for dependency declaration. This will fail with an error in Gradle 7.0. Please use the implementation configuration instead.

Inspect the exercise build scripts, including *_template*-ed and applied scripts, for dependency declarations using the deprecated compile configuration. Replace the relevant declarations with implementation, then run the Gradle build or exercise checks and confirm the deprecation warning is gone.

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