COMPAT: tackle numpy row_stack deprecation

[martinfleis]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.4%. Comparing base (4b9970d) to head (552f9e8).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #773     +/-   ##
=======================================
- Coverage   85.4%   85.4%   -0.0%     
=======================================
  Files        150     150             
  Lines      15989   15998      +9     
=======================================
+ Hits       13655   13656      +1     
- Misses      2334    2342      +8     

Files with missing lines	Coverage Δ
libpysal/graph/_triangulation.py	98.0% <100.0%> (ø)
libpysal/graph/tests/test_matching.py	98.0% <100.0%> (ø)
libpysal/weights/gabriel.py	91.1% <100.0%> (ø)

[jGaboardi]

Thanks!