GDPOpt: Switching a LBB test to use Gurobi as MINLP solver

[emma58]

Fixes current GDPopt test failure after BARON released 23.1.5

Summary/Motivation:

BARON 23.1.5 is returning a wrong answer during gdpopt.lbb, causing it to converge to the wrong solution. This switches the test to use Gurobi for now because it's quadratic anyway...

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[bernalde]

I would suggest also making the problem instance available to MINLP.com as finding bugs in BARON gives you a badge of honor with Nick.

[codecov]

Codecov Report

Base: 87.06% // Head: 87.07% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (3bf9f8c) compared to base (8f7174f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2686   +/-   ##
=======================================
  Coverage   87.06%   87.07%           
=======================================
  Files         757      757           
  Lines       84503    84503           
=======================================
+ Hits        73573    73577    +4     
+ Misses      10930    10926    -4     

Flag	Coverage Δ
linux	84.51% <ø> (+<0.01%)	⬆️
osx	74.54% <ø> (ø)
other	84.69% <ø> (ø)
win	81.84% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyomo/contrib/mindtpy/iterate.py	81.36% <0.00%> (+1.81%)	⬆️

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