CompatHelper: bump compat for "Symbolics" to "4.2"

[github-actions[bot]]

This pull request changes the compat entry for the Symbolics package from 3 to 3, 4.2.

This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov[bot]]

Codecov Report

Merging #23 (765dffc) into master (6a2a751) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 765dffc differs from pull request most recent head e251be5. Consider uploading reports for the commit e251be5 to get more accurate results

@@           Coverage Diff           @@
##           master      #23   +/-   ##
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  Coverage   23.79%   23.79%           
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  Files          23       23           
  Lines        1845     1845           
=======================================
  Hits          439      439           
  Misses       1406     1406           

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