Old Dokka plugin breaks with Gradle 7+

[deepy]

     Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.3/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'org.jetbrains.dokka' type 'org.jetbrains.dokka.gradle.DokkaTask' property 'configuration.name' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

[deepy]

And https://github.com/Kotlin/dokka/issues/1692 prevents us from upgrading the Dokka plugin :-/

[deepy]

Going to give up on the javadoc, it's not particularly useful in its current state and we need better documentation