Fix GitHub Actions

[jonathan343]

Summary

This PR fixes the GitHub Actions CI workflow to properly support Python 3.12, 3.13, and 3.14. The existing jobs all run on Python 3.12 and don't actually test different python versions.

Changes

• CI workflow improvements:
  • Added pushes to main branch to trigger list
  • Switched from actions/setup-python to using uv's built-in Python version management
  • Enabled UV cache for faster builds
  • Restricted linting and formatting checks to only run on Python 3.12
  • Changed Python 3.14-dev to 3.14 (now stable)
  • Removed UV_SYSTEM_PYTHON environment variable
• Dependency updates:
  • Upgraded aiohttp from 3.11.18 to 3.13.0 for Python 3.14 compatibility
• Cleanup:
  • Removed deprecated docformatter package from linting dependencies and Makefile
  • Removed unused black from dependencies (already using ruff)

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[jonathan343]

Closing thoughts:
Removing docformatter results in lost formatting coverage. I created #571 to track adding this coverage back through a newer version of docformatter (when available) or through ruff (preferred)