respect spec000, add oldest & dev testing

[jGaboardi]

This PR

• resolves pinned oldest dependencies & tests against them #262
• xref
  • Adopt spec 0 across pysal pysal#1375
  • testing against oldest dependencies across federation pysal#1339

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.58%. Comparing base (9a8cbd3) to head (862e7f9).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #263   +/-   ##
=======================================
  Coverage   82.58%   82.58%           
=======================================
  Files          66       66           
  Lines        2302     2302           
=======================================
  Hits         1901     1901           
  Misses        401      401           

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