Pulp v4 compatibility

[FirePheonix]

based on discussions and conclusions done on: pysal/libpysal#907,
the following PR solves all PULP v4 issues on spopt.

[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.1%. Comparing base (9b36063) to head (68036b9).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
spopt/locate/flow.py	71.9%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #527     +/-   ##
=======================================
+ Coverage   76.9%   77.1%   +0.2%     
=======================================
  Files         29      29             
  Lines       3700    3751     +51     
=======================================
+ Hits        2846    2891     +45     
- Misses       854     860      +6     

Files with missing lines	Coverage Δ
spopt/locate/base.py	95.0% <100.0%> (+0.6%)	⬆️
spopt/locate/coverage.py	97.8% <100.0%> (ø)
spopt/locate/p_center.py	100.0% <100.0%> (ø)
spopt/locate/p_median.py	98.7% <100.0%> (+0.1%)	⬆️
spopt/locate/flow.py	73.1% <71.9%> (-0.1%)	⬇️

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[jGaboardi]

Let's hold off on this review until we get @ljwolf's on pysal/libpysal#907