[SPARK-31547][BUILD] Upgrade Genjavadoc to 0.16

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to upgrade Genjavadoc to 0.16.

Why are the changes needed?

Although we skipped Scala 2.12.11, this brings 2.12.11 official support and better 2.12.12 compatibility.

• https://github.com/lightbend/genjavadoc/commits/v0.16

Does this PR introduce any user-facing change?

No. (The generated doc is the same)

How was this patch tested?

Build with 0.15 and 0.16.

$ SKIP_PYTHONDOC=1 SKIP_RDOC=1 SKIP_SQLDOC=1 jekyll build

Compare the result. The generated doc is identical.

$ diff -r _site_0.15 _site_0.16 | grep -v '^diff -r' | grep -v 'Generated by javadoc' | sort | uniq
---
5c5

[dongjoon-hyun]

cc @sarutak

[sarutak]

I'll take at this.

[SparkQA]

Test build #121704 has finished for PR 28321 at commit 93c8f09.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

Let me leave it to @sarutak

[sarutak]

LGTM. I also checked on my laptop.
Merging this into master. Thanks @dongjoon-hyun and @HyukjinKwon !

[dongjoon-hyun]

Thank you, @sarutak and @HyukjinKwon !

[sarutak]

@HyukjinKwon Thanks for closing the ticket in JIRA.