COMPAT: compatibility with pandas 3

[martinfleis]

pandas no longer returns names of MultiIndex as a list but as a tuple. Making our check compatible.

This will need to be released before pandas 3 which is scheduled for April. Otherwise, graph module will be unusable with pandas 3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.9%. Comparing base (018f1e2) to head (d6142d7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #692     +/-   ##
=======================================
+ Coverage   84.7%   84.9%   +0.2%     
=======================================
  Files        141     141             
  Lines      15200   15199      -1     
=======================================
+ Hits       12880   12910     +30     
+ Misses      2320    2289     -31     

Files	Coverage Δ
libpysal/graph/base.py	97.9% <100.0%> (ø)

... and 11 files with indirect coverage changes