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

[github-actions]

This pull request changes the compat entry for the LoopVectorization package from 0.7.4 to 0.7.4, 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 #8 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   98.83%   98.83%           
=======================================
  Files           4        4           
  Lines         258      258           
=======================================
  Hits          255      255           
  Misses          3        3           

Flag	Coverage Δ
#unittests	98.83% <ø> (ø)

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