build: Remove support for Python 3.10

[Oliver Borchert (borchero)]

Motivation

Python 3.10 is EOL.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2bd5100) to head (be49475).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #414   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           46        46           
  Lines         2616      2584   -32     
=========================================
- Hits          2616      2584   -32     

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[Copilot]

🟡 Changes recommended

The CI matrix runs Python 3.11 twice on every operating system, creating redundant jobs.

1 open finding

• Remove duplicate py311 CI matrix entries · New

What changed in this PR

Raises the minimum supported Python version to 3.11 across packaging, builds, tooling, and compatibility code.

Changes:

• Updates package metadata, Pixi environments, PyO3 ABI, and build configuration.
• Removes Python 3.10 compatibility imports and dependency.
• Moves linting and CI coverage to Python 3.11+.

File	Description
pyproject.toml	Requires Python 3.11 and removes compatibility dependency.
pixi.toml	Replaces Python 3.10 environments with 3.11.
dataframely/​schema.py	Imports Self directly from typing.
dataframely/​filter_result.py	Imports NamedTuple directly from typing.
dataframely/​config.py	Imports Unpack directly from typing.
dataframely/​columns/​_mixins.py	Removes conditional Self import.
dataframely/​columns/​_base.py	Removes conditional Self import.
dataframely/​collection/​filter_result.py	Removes conditional NamedTuple import.
dataframely/​collection/​collection.py	Removes conditional Self import.
dataframely/​collection/​_base.py	Removes conditional Self import.
dataframely/​_rule.py	Removes conditional Self import.
dataframely/​_deprecation.py	Removes the typing_extensions decorator path.
dataframely/​_base_schema.py	Removes conditional Self import.
Cargo.toml	Raises the PyO3 stable ABI baseline to 3.11.
.lefthook.yaml	Runs mypy in the Python 3.11 environment.
.github/​workflows/​ci.yml	Updates CI environments to Python 3.11+.
.github/​workflows/​build.yml	Builds wheels using Python 3.11.
.copier-answers.yml	Records Python 3.11 as the project minimum.

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