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

[github-actions]

This pull request changes the compat entry for the VLBIImagePriors 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

All modified and coverable lines are covered by tests ✅

Project coverage is 89.19%. Comparing base (05dd65f) to head (37979bf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #373   +/-   ##
=======================================
  Coverage   89.19%   89.19%           
=======================================
  Files          30       30           
  Lines        1583     1583           
=======================================
  Hits         1412     1412           
  Misses        171      171           

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[ptiede]

Handled by #374