[Dev] MINPACK fsolve

[jbcaillau]

@ocots FTR (info from @horasio): on mac (with intel proc), pinning cminpack_jll as below allows to use fsolve:
https://github.com/mctao-inria/launchers/blob/master/powered_descent_guidance/Project.toml

[jbcaillau]

@ocots private repo, attaching the file

Project.toml.txt