fix failing doctests, other actions maint, ensure docs build, etc

[jGaboardi]

This PR:

• fixes the failing doctests
  • resolves docs building is failing #114
• update CI naming conventions as per:
  • https://github.com/orgs/pysal/discussions/1278#discussioncomment-13567804
  • standardize CI environment naming conventions pysal#1338
• fix version docs when building
  • resolves add with: fetch-depth: 0 for checkout in build_docs.yml #233
• update build_docs.yml with modern action
• lints YAML action files

@weikang9009 – once you have had time to review this PR and we get it merged I will do another PR to update & fix the ruff linting & formatting.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.2%. Comparing base (912c47a) to head (4975926).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #239      +/-   ##
========================================
+ Coverage   65.9%   88.2%   +22.3%     
========================================
  Files         10      10              
  Lines       1591    1591              
========================================
+ Hits        1049    1404     +355     
+ Misses       542     187     -355     

Files with missing lines	Coverage Δ
giddy/markov.py	77.4% <ø> (+20.0%)	⬆️
giddy/plotting.py	92.7% <ø> (ø)

... and 5 files with indirect coverage changes

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