patch: Drop support for Python 3.9

[jmgate]

Also add support for Python 3.14.

Summary by Sourcery

Drop support for Python 3.9, bump minimum Python requirement to 3.10, and add support for Python 3.14 across packaging, CI, and documentation.

Enhancements:

• Update pyproject.toml to require Python >=3.10, remove Python 3.9 classifier, and add Python 3.14 classifier
• Update GitHub Actions matrix to test on Python 3.10–3.14 instead of 3.9–3.13
• Refresh README Python version badge to reflect support for 3.10–3.14

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This patch removes support for Python 3.9 and introduces support for Python 3.14 by updating project metadata, CI configuration, and documentation to reflect the new supported version range.

File-Level Changes

Change	Details	Files
Update project metadata to drop Python 3.9 and add Python 3.14	Removed Python 3.9 classifier Bumped python dependency minimum from >=3.8 to >=3.10 Added Python 3.14 classifier	pyproject.toml
Adjust CI workflow matrix to match supported Python versions	Removed 3.9 from test matrix Added 3.14 to test matrix	.github/workflows/continuous-integration.yml
Refresh documentation and badges to reflect supported versions	Updated README badge to replace 3.9 with 3.14 Aligned documentation in index.rst with new version support	README.md doc/source/index.rst

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dfe703d) to head (2a8d891).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #241   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          176       176           
  Branches        15        15           
=========================================
  Hits           176       176           

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