CompatHelper: bump compat for JSON in [weakdeps] to 1, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the JSON package from 0.21.4 to 0.21.4, 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 98.40%. Comparing base (45f3577) to head (48ed991).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #45   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files           3        3           
  Lines         251      251           
=======================================
  Hits          247      247           
  Misses          4        4           

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