CompatHelper: bump compat for CUDAnative to 3, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the CUDAnative package from 2 to 2, 3.
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 #14 (caabe62) into master (34593a8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   64.19%   64.19%           
=======================================
  Files           1        1           
  Lines          81       81           
=======================================
  Hits           52       52           
  Misses         29       29           

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