CompatHelper: bump compat for "CSV" to "0.8"

[github-actions]

This pull request changes the compat entry for the CSV package from 0.7 to 0.7, 0.8.

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 #51 (4cfd05f) into master (109c3ef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   82.92%   82.92%           
=======================================
  Files          29       29           
  Lines        2301     2301           
=======================================
  Hits         1908     1908           
  Misses        393      393           

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