Refac2gradle8

[rdomingonl]

Problem Previous implementation didn't run using gradle 8 because of some api changes in gradle.

Beause of this running the plantUml plugin failed

Task :plantUml FAILED [PlantUml] Gradle cannot use an incremental build - rendering everything ... FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':plantUml'.

  Could not find method submit() for arguments [class com.cosminpolifronie.gradle.plantuml.PlantUmlRenderer, com.cosminpolifronie.gradle.plantuml.tasks.PlantUmlTask$1@17fdfbab] on object of type org.gradle.workers.internal.DefaultWorkerExecutor.

Solution I refactored implementation using the new gradle 8 api's and all seems to work again.

TODO The test passes, but I haven't tested the plugin from cli.

[rdomingonl]

@cosminpolifronie can you please review my pull request?