CompatHelper: bump compat for AlgebraOfGraphics to 0.12, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the AlgebraOfGraphics package from 0.7, 0.8, 0.9, 0.10, 0.11 to 0.7, 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 87.63%. Comparing base (26128e4) to head (c57cb32).
⚠️ Report is 70 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #400   +/-   ##
=======================================
  Coverage   87.63%   87.63%           
=======================================
  Files          26       26           
  Lines        1237     1237           
=======================================
  Hits         1084     1084           
  Misses        153      153           

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