CompatHelper: bump compat for JSON to 1, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the JSON package from 0.21 to 0.21, 1.
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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.72%. Comparing base (1211119) to head (c239c58).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #78   +/-   ##
=======================================
  Coverage   43.72%   43.72%           
=======================================
  Files          13       13           
  Lines       31207    31207           
=======================================
  Hits        13646    13646           
  Misses      17561    17561           

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