Drop support for Python 3.11

[mattwthompson]

Description

(Does not go into a release before April 24, 2026)

Closes #174
Drops Python 3.11

Todos

Notable points that this PR has either accomplished or will accomplish.

• Drops Python 3.11

Status

• Ready to go

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (faeef71) to head (fe332fd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #172   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files           6        6           
  Lines         187      187           
=======================================
  Hits          168      168           
  Misses         19       19           

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[mattwthompson]

@copilot anything I'm missing?

[Copilot]

@copilot anything I'm missing?

Just a missing release history entry — added in 84a39b8. Everything else looks good: pyproject.toml has requires-python = ">=3.12" and the correct classifiers, pixi.toml has the py311 feature and all environments removed, and both CI workflows are updated.