feat: better jruby dependency listings in VersionInfo

[flavorjones]

What problem is this PR intended to solve?

After moving to maven-managed dependencies, the output from nokogiri -v looked like:

# Nokogiri (1.14.0.dev)
    ---
    warnings: []
    nokogiri:
      version: 1.14.0.dev
    ruby:
      version: 2.6.8
      platform: java
      gem_platform: universal-java-11
      description: jruby 9.3.2.0 (2.6.8) 2021-12-01 0b8223f905 OpenJDK 64-Bit Server VM
        11.0.15+10-Ubuntu-0ubuntu0.20.04.1 on 11.0.15+10-Ubuntu-0ubuntu0.20.04.1 [linux-x86_64]
      engine: jruby
      jruby: 9.3.2.0
    other_libraries:
      isorelax: isorelax:isorelax:20030108
      Saxon-HE: net.sf.saxon:Saxon-HE:9.6.0-4
      neko-htmlunit: net.sourceforge.htmlunit:neko-htmlunit:2.61.0
      jing: nu.validator:jing:20200702VNU
      nekodtd: org.nokogiri:nekodtd:0.1.11.noko1
      serializer: xalan:serializer:2.7.2
      xalan: xalan:xalan:2.7.2
      xercesImpl: xerces:xercesImpl:2.12.2
      xml-apis: xml-apis:xml-apis:1.4.01

after this PR it looks like:

# Nokogiri (1.14.0.dev)
    ---
    warnings: []
    nokogiri:
      version: 1.14.0.dev
    ruby:
      version: 2.6.8
      platform: java
      gem_platform: universal-java-11
      description: jruby 9.3.2.0 (2.6.8) 2021-12-01 0b8223f905 OpenJDK 64-Bit Server VM
        11.0.15+10-Ubuntu-0ubuntu0.20.04.1 on 11.0.15+10-Ubuntu-0ubuntu0.20.04.1 [linux-x86_64]
      engine: jruby
      jruby: 9.3.2.0
    other_libraries:
      isorelax:isorelax: '20030108'
      net.sf.saxon:Saxon-HE: 9.6.0-4
      net.sourceforge.htmlunit:neko-htmlunit: 2.61.0
      nu.validator:jing: 20200702VNU
      org.nokogiri:nekodtd: 0.1.11.noko1
      xalan:serializer: 2.7.2
      xalan:xalan: 2.7.2
      xerces:xercesImpl: 2.12.2
      xml-apis:xml-apis: 1.4.01

(note the change to other_libraries).

See #2432 for the changeset that introduced the previous format.

Have you included adequate test coverage?

Existing coverage should suffice.

Does this change affect the behavior of either the C or the Java implementations?

Only the JRuby VERSION_INFO has changed.