CompatHelper: bump compat for GLMakie in [weakdeps] to 0.12, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the GLMakie package from 0.8, 0.9, 0.10, 0.11 to 0.8, 0.9, 0.10, 0.11, 0.12.
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 67.63%. Comparing base (0426f36) to head (78d0664).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #199   +/-   ##
=======================================
  Coverage   67.63%   67.63%           
=======================================
  Files          37       37           
  Lines        5652     5652           
=======================================
  Hits         3823     3823           
  Misses       1829     1829           

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