COMPAT: pandas 3.0 compatibillity in Graph

[martinfleis]

Ensuring compatibility with the new StringDtype given pandas 3.0 has an RC now. This warrants a quick patch release to avoid breakage when pandas 3.0 comes out fully.

[martinfleis]

I added skips of the tests using EEA large rivers which is not reliably available. I will try to fix that in geodatasets.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.4%. Comparing base (e47859e) to head (f12f3bb).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #814   +/-   ##
=====================================
  Coverage   85.4%   85.4%           
=====================================
  Files        150     150           
  Lines      15954   15957    +3     
=====================================
+ Hits       13620   13624    +4     
+ Misses      2334    2333    -1     

Files with missing lines	Coverage Δ
libpysal/graph/_utils.py	97.7% <100.0%> (+0.6%)	⬆️
libpysal/graph/base.py	96.5% <100.0%> (+<0.1%)	⬆️
libpysal/graph/tests/test_base.py	100.0% <ø> (ø)

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[martinfleis]

I enabled those EEA-based tests again but the new version of geodatasets might need to propagate to the right conda server. Should work soon though.