CompatHelper: bump compat for GeometricEquations to 0.16, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the GeometricEquations package from 0.12, 0.13, 0.14, 0.15 to 0.12, 0.13, 0.14, 0.15, 0.16.
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

Attention: Patch coverage is 62.50000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 80.76%. Comparing base (dc8378f) to head (0f89fc6).

Files	Patch %	Lines
src/lagrangian_degenerate.jl	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   81.81%   80.76%   -1.05%     
==========================================
  Files           6        6              
  Lines         220      234      +14     
==========================================
+ Hits          180      189       +9     
- Misses         40       45       +5     

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