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

[github-actions]

This pull request changes the compat entry for the FastTransforms package from 0.6 to 0.6, 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 #20 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   60.37%   60.37%           
=======================================
  Files          90       90           
  Lines        5227     5227           
=======================================
  Hits         3156     3156           
  Misses       2071     2071           

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