Use ccfsg for cons!

[amontoison]

Should be merged after #375
Suggested by Nick Gould.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 3 lines in your changes missing coverage. Please review.

Project coverage is 76.92%. Comparing base (f2ad6a4) to head (f3c87ef).
Report is 75 commits behind head on main.

Files	Patch %	Lines
src/julia_interface.jl	90.90%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #394       +/-   ##
===========================================
- Coverage   89.11%   76.92%   -12.20%     
===========================================
  Files           5        8        +3     
  Lines         790     1547      +757     
===========================================
+ Hits          704     1190      +486     
- Misses         86      357      +271     

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