Fix type instability in CUTEst.jl due to support for single and quadruple precision

[amontoison]

Found in libprima/PRIMA.jl#31

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.69%. Comparing base (f2ad6a4) to head (09ba18d).
Report is 101 commits behind head on main.

Files with missing lines	Patch %	Lines
src/model.jl	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #414       +/-   ##
===========================================
- Coverage   89.11%   74.69%   -14.42%     
===========================================
  Files           5        7        +2     
  Lines         790     1644      +854     
===========================================
+ Hits          704     1228      +524     
- Misses         86      416      +330     

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