CompatHelper: bump compat for JuliaFormatter in [extras] to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the JuliaFormatter package from 1 to 1, 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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.26%. Comparing base (46bef09) to head (71ac102).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
- Coverage   90.15%   89.26%   -0.90%     
==========================================
  Files           6        6              
  Lines         325      298      -27     
==========================================
- Hits          293      266      -27     
  Misses         32       32              

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