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

[github-actions]

This pull request changes the compat entry for the JSON package from 0.21 to 0.21, 1 for package JuliaBUGS.
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 83.26%. Comparing base (53fd7bb) to head (fb529d7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #399   +/-   ##
=======================================
  Coverage   83.26%   83.26%           
=======================================
  Files          31       31           
  Lines        3759     3759           
=======================================
  Hits         3130     3130           
  Misses        629      629           

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