Warning about a Gradle features deprecated in 6.0

[plavjanik]

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.2.1/userguide/command_line_interface.html#sec:command_line_warnings

[github-actions]

This issue has not been updated in a long time.