CompatHelper: bump compat for VLBISkyModels to 0.3, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the VLBISkyModels package from 0.2 to 0.2, 0.3.
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

Patch and project coverage have no change.

Comparison is base (21c9057) 78.79% compared to head (0697ebe) 78.79%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #315   +/-   ##
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  Coverage   78.79%   78.79%           
=======================================
  Files          19       19           
  Lines        1787     1787           
=======================================
  Hits         1408     1408           
  Misses        379      379           

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