Remove Octeract from the list of expected NEOS solvers (and other infrastructure fixes)

[jsiirola]

Fixes # .

Summary/Motivation:

As of 19 Sept it appears that Octeract has been removed from the list of AMPL solvers on NEOS. This PR tracks that change so that our tests continue to run/pass.

While fixing the Octeract issue a number of other infrastructure issues cropped up so this PR also includes several small fixes for those.

Changes proposed in this PR:

• Remove expectation that 'octeract' is in the list of NEOS solvers with AMPL interfaces
• Pin setuptools to <74.0.0 for windows due to an issue with compiling APPSI
• Switch to macos-latest runner on GHA
• Remove degeneracy from GDP book example
• Update a fragile test in kernel Delaunay triangulation
• Add a slight negative tolerance to post processing in FME test to address a numerical issue

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.63%. Comparing base (df51e99) to head (ad049f4).
Report is 929 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3374   +/-   ##
=======================================
  Coverage   88.63%   88.63%           
=======================================
  Files         879      879           
  Lines      100221   100221           
=======================================
  Hits        88827    88827           
  Misses      11394    11394           

Flag	Coverage Δ
linux	86.27% <ø> (ø)
osx	75.64% <ø> (-0.40%)	⬇️
other	86.76% <ø> (-0.01%)	⬇️
win	84.02% <ø> (-0.09%)	⬇️

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[mrmundt]

Oh look, and Windows is still not fine.