CompatHelper: bump compat for GraphMakie in [weakdeps] to 0.6, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the GraphMakie package from 0.5.14 to 0.5.14, 0.6.
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 72.52%. Comparing base (8ae0b9b) to head (5ade95b).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1158   +/-   ##
========================================
  Coverage    72.52%   72.52%           
========================================
  Files           29       29           
  Lines         2428     2428           
========================================
  Hits          1761     1761           
  Misses         667      667           

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