[Groovydoc] Support properties added in Gradle 7.5

[aalmiray]

Gradle 7.5 added the following properties without default values, making them required

• Type 'org.gradle.api.tasks.javadoc.Groovydoc' property 'includeAuthor' doesn't have a configured value.

  Reason: This property isn't marked as optional and no value has been configured.

  Possible solutions:

  1. Assign a value to 'includeAuthor'.
  2. Mark property 'includeAuthor' as optional.

  Please refer to https://docs.gradle.org/7.6/userguide/validation_problems.html#value_not_set for more details about this problem.

• Type 'org.gradle.api.tasks.javadoc.Groovydoc' property 'includeMainForScripts' doesn't have a configured value.

  Reason: This property isn't marked as optional and no value has been configured.

  Possible solutions:

  1. Assign a value to 'includeMainForScripts'.
  2. Mark property 'includeMainForScripts' as optional.

  Please refer to https://docs.gradle.org/7.6/userguide/validation_problems.html#value_not_set for more details about this problem.

• Type 'org.gradle.api.tasks.javadoc.Groovydoc' property 'processScripts' doesn't have a configured value.

  Reason: This property isn't marked as optional and no value has been configured.

  Possible solutions:

  1. Assign a value to 'processScripts'.
  2. Mark property 'processScripts' as optional.

  Please refer to https://docs.gradle.org/7.6/userguide/validation_problems.html#value_not_set for more details about this problem.

[aalmiray]

Completed with https://github.com/kordamp/kordamp-gradle-plugins/commit/633c3ecd2d325b478d89c8fb0ceba3f451775615