CompatHelper: bump compat for CSV to 0.9, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the CSV package from 0.8 to 0.8, 0.9.
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 #13 (a05e2c2) into main (1e7b77c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   73.23%   73.23%           
=======================================
  Files          12       12           
  Lines         990      990           
=======================================
  Hits          725      725           
  Misses        265      265           

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