Improve gravmag3d while waiting that the new version of GMT_Jll becomes available.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.57895% with 14 lines in your changes missing coverage. Please review.

Project coverage is 85.92%. Comparing base (68aeb70) to head (60e26e0).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/potential/gmtgravmag3d.jl	52.63%	9 Missing ⚠️
src/common_options.jl	0.00%	4 Missing ⚠️
src/potential/gravprisms.jl	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1652      +/-   ##
==========================================
+ Coverage   85.91%   85.92%   +0.01%     
==========================================
  Files         152      152              
  Lines       21316    21371      +55     
==========================================
+ Hits        18313    18364      +51     
- Misses       3003     3007       +4     

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