Regular maintenance 202405

[amotl]

• CI: Update to codecov/codecov-action@v4
• Chore: Update dependencies across the board, and format code
  • Updated: pandas<2, mypy, pyproject-fmt, ruff
  • Removed: black
• CI: Add configuration for Codecov.io, codecov.yml

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.29%. Comparing base (2408f8d) to head (1c18692).
Report is 1 commits behind head on main.

Files	Patch %	Lines
skeem/io.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   83.36%   83.29%   -0.08%     
==========================================
  Files          27       27              
  Lines         944      946       +2     
==========================================
+ Hits          787      788       +1     
- Misses        157      158       +1     

Flag	Coverage Δ
unittests	83.29% <50.00%> (-0.08%)	⬇️

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