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

[github-actions]

This pull request changes the compat entry for the ForwardDiff package from 0.10.38 to 0.10.38, 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 88.95%. Comparing base (f6db6f1) to head (b38e3d2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   88.95%   88.95%           
=======================================
  Files           7        7           
  Lines        1358     1358           
=======================================
  Hits         1208     1208           
  Misses        150      150           

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