CompatHelper: bump compat for Arrow to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Arrow 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

Merging #573 (cca0c92) into main (bf8b777) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #573   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files          28       28           
  Lines        2509     2509           
=======================================
  Hits         2415     2415           
  Misses         94       94           

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