CompatHelper: bump compat for CairoMakie to 0.12 for package PolynomialFitting, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the CairoMakie package from 0.9, 0.10, 0.11 to 0.9, 0.10, 0.11, 0.12 for package PolynomialFitting. 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.79%. Comparing base (26c8429) to head (7d3bd77). Report is 10 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #633 +/- ## ========================================== - Coverage 87.37% 86.79% -0.59% ========================================== Files 43 43 Lines 2241 2241 ========================================== - Hits 1958 1945 -13 - Misses 283 296 +13 ```

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