Gradle 8 deprecated methods.

[Amartel1986]

When running the plugin with gradle 8.4 I get warnings:

The Project.getConvention() method has been deprecated. This is scheduled to be removed in Gradle 9.0. Consult the upgrading guide for further information: https://docs.gradle.org/8.4/userguide/upgrading_version_8.html#deprecated_access_to_conventions
The org.gradle.api.plugins.Convention type has been deprecated. This is scheduled to be removed in Gradle 9.0. Consult the upgrading guide for further information: https://docs.gradle.org/8.4/userguide/upgrading_version_8.html#deprecated_access_to_conventions
The org.gradle.api.plugins.JavaPluginConvention type has been deprecated. This is scheduled to be removed in Gradle 9.0. Consult the upgrading guide for further information: https://docs.gradle.org/8.4/userguide/upgrading_version_8.html#java_convention_deprecation