Update supported Python versions

[avendesora]

Description

Please include a summary of the change and which issue is fixed (if applicable). Please also include relevant motivation and context. List any dependencies that are required for this change.

Checklist:

• I have read the CONTRIBUTING document.
• I have added tests that prove my fix is effective or that my feature works.
• I have run pre-commit locally prior to submission and fixed any errors/warnings.
• I have run tests locally prior to submission and they are passing.
• I have added necessary documentation (if appropriate).
• I have updated the README (if appropriate).
• I have updated the CHANGELOG (if appropriate).
• I have updated the version number (if appropriate).
• I have updated the requirements (if appropriate).

Summary by Sourcery

Update project to drop Python 3.8 support and add Python 3.14 support across metadata, CI, configuration, and documentation while bumping the release version to 0.13.1.

Enhancements:

• Remove Python 3.8 and add Python 3.14 in nox sessions and coverage configuration
• Set nox default virtual environment backend to uv
• Bump release version to 0.13.1 in docs and project metadata
• Update requires-python to ">=3.9" in pyproject.toml

Build:

• Add Python 3.14 and remove Python 3.8 in pyproject.toml classifiers

CI:

• Update GitHub Actions and noxfile to run tests on Python 3.9–3.14
• Adjust coverage session to use Python 3.13

Documentation:

• Refresh README badge and Sphinx config to reflect supported Python versions
• Update CHANGELOG with added and removed Python versions

Chores:

• Update sourcery config Python version to 3.9

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR standardizes the project’s supported Python versions by dropping 3.8 and adding 3.14 throughout the codebase, updates the release metadata, and tweaks the test runner configuration.

Flow diagram for updated test session Python versions in Nox

flowchart TD
    NoxSession[Nox test session]
    NoxSession -->|Runs tests on| Python39[Python 3.9]
    NoxSession -->|Runs tests on| Python310[Python 3.10]
    NoxSession -->|Runs tests on| Python311[Python 3.11]
    NoxSession -->|Runs tests on| Python312[Python 3.12]
    NoxSession -->|Runs tests on| Python313[Python 3.13]
    NoxSession -->|Runs tests on| Python314[Python 3.14]

Loading

File-Level Changes

Change	Details	Files
Standardize supported Python versions across configs and docs	Removed Python 3.8 references Added Python 3.14 references Updated requires-python constraint to >=3.9 Adjusted test matrix in CI and nox sessions	CHANGELOG.md noxfile.py .github/workflows/tests.yml pyproject.toml README.md .sourcery.yaml
Bump release version and author copyright	Updated release version Extended copyright year	docs/source/conf.py
Adjust nox default backend	Set default venv backend to 'uv'	noxfile.py

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[sourcery-ai]

Hey @avendesora - I've reviewed your changes - here's some feedback:

• The installation guide in docs/source/installation.rst still lists the old Python support and should be updated to match the new >=3.9 requirement.
• Make sure the project version in pyproject.toml (under tool.flit.metadata) is bumped to match the new release (0.13.1).
• Consider running the coverage session on the minimum supported Python version (3.9) instead of only on 3.13 to catch compatibility issues early.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- The installation guide in docs/source/installation.rst still lists the old Python support and should be updated to match the new >=3.9 requirement.
- Make sure the project version in pyproject.toml (under tool.flit.metadata) is bumped to match the new release (0.13.1).
- Consider running the coverage session on the minimum supported Python version (3.9) instead of only on 3.13 to catch compatibility issues early.

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d47c7ab)	1875	1875	100.00%
Head commit (a007f0b)	1875 (+0)	1875 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#202)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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