ci: support Python 3.10+ versions in CI and project configuration

[Copilot]

This PR extends Python version support from the current 3.12+ to 3.10+, enabling broader compatibility for users while maintaining all existing functionality.

Changes Made

• pyproject.toml: Updated requires-python from >=3.12 to >=3.10 and ruff target-version from py312 to py310
• .python-version: Changed from 3.12 to 3.13 for development, while maintaining Python 3.10+ support in the package
• .github/workflows/ci.yml: Extended CI matrix to test Python 3.10, 3.11, 3.12, and 3.13 across all platforms

Technical Rationale

The codebase already uses Python 3.10+ syntax (union types with | operator), making 3.10 a natural minimum version. This change provides better accessibility for users on older Python versions while ensuring the code remains compatible with newer versions. The development environment uses Python 3.13 to leverage the latest features and improvements.

Verification

• All existing tests pass on Python 3.10
• Linting and building work correctly with the updated configuration
• CI workflow syntax is valid and will now test across 4 Python versions

Fixes #33.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull Request Overview

This PR extends Python version support from 3.12+ to 3.10+ to improve compatibility while maintaining existing functionality. The changes update project configuration files to support the broader Python version range and expand CI testing coverage.

Key changes:

• Updated minimum Python version requirement from 3.12 to 3.10
• Extended CI matrix to test Python 3.10, 3.11, 3.12, and 3.13
• Updated tooling configuration to target Python 3.10

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
pyproject.toml	Updated requires-python and ruff target-version to support Python 3.10+
.python-version	Changed from 3.12 to 3.13 for development environment
.github/workflows/ci.yml	Added Python 3.10 and 3.11 to CI test matrix

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[Ki-Seki]

@copilot change the pr description. I've change the development python version to 3.13

[Copilot]

@copilot change the pr description. I've change the development python version to 3.13

Updated the PR description to reflect that the development Python version is now set to 3.13 in .python-version (commit 1709d0e). The package still supports Python 3.10+ as specified in pyproject.toml.