Upgrade dokka to 1.6.10 following gradle upgrade

[alancai98]

Tried publishing a new version of PIG to maven, but got the following error:

> Task :pig:dokka FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Some problems were found with the configuration of task ':pig:dokka' (type 'DokkaTask').
  - In plugin 'org.jetbrains.dokka' type 'org.jetbrains.dokka.gradle.DokkaTask' property 'dokkaRuntime' is missing an input or output annotation.

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

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

    Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'org.jetbrains.dokka' type 'org.jetbrains.dokka.gradle.DokkaTask' property 'outputDirectory' is missing an input or output annotation.

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

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

    Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'org.jetbrains.dokka' type 'org.jetbrains.dokka.gradle.DokkaTask' property 'reportNotDocumented' is missing an input or output annotation.

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

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

    Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem.

Upgrading the gradle version to 7 causes the above dokka error when publishing. I had to do something similar when publishing partiql-isl-kotlin: partiql/partiql-isl-kotlin#4.

Tested by publishing to maven local:

❯ ./gradlew publishToMavenLocal

> Task :pig:dokkaHtml
Initializing plugins
Dokka is performing: documentation for pig
Validity check
Creating documentation models
Transforming documentation model before merging
Merging documentation models
Transforming documentation model after merging
Creating pages
Transforming pages
Rendering
Running post-actions


> Task :pig-runtime:dokkaHtml
Initializing plugins
Dokka is performing: documentation for pig-runtime
Validity check
Creating documentation models
Transforming documentation model before merging
Merging documentation models
Transforming documentation model after merging
Creating pages
Transforming pages
Rendering
Running post-actions


Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

See https://docs.gradle.org/7.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 24s

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[am357]

🚢