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 86.48%. Comparing base (6f7ee3d) to head (137b105).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1262   +/-   ##
=======================================
  Coverage   86.48%   86.48%           
=======================================
  Files         148      148           
  Lines        4660     4660           
=======================================
  Hits         4030     4030           
  Misses        630      630           

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