chore!: Drop Node 12 support

[breautek]

Platforms affected

Android

Motivation and Context

Node LTS Support is coming to an end April 2022. So it's a good time to drop support for Node 12 for our next major release.

Description

Removed Node 12 from our test matrix, and upgraded our package Node engines.

Testing

Ran npm test

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

Merging #1411 (bfd26ca) into master (6d3ce21) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1411   +/-   ##
=======================================
  Coverage   73.20%   73.20%           
=======================================
  Files          21       21           
  Lines        1646     1646           
=======================================
  Hits         1205     1205           
  Misses        441      441           

Impacted Files	Coverage Δ
lib/env/java.js	98.00% <0.00%> (ø)

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