Document Python 3.14 support

[Copilot]

Adds Python 3.14 to the list of officially supported Python versions.

Changes

• pyproject.toml: Added Programming Language :: Python :: 3.14 classifier
• .github/workflows/ci.yml: Updated test matrix to use Python 3.14 (tests run on 3.9 and 3.14, covering min and max supported versions)

The minimum Python requirement (requires-python >= 3.9) remains unchanged.

Original prompt

make a PR adding Python 3.14 to the list of supported python: update the pyproject.toml, the CI python tests, and everywhere else necessary to support python 3.14

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ce65821) to head (e3c2af0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #39   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            6         6           
=========================================
  Hits             6         6           

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[Copilot]

Pull request overview

This PR adds Python 3.14 to the list of officially supported Python versions for the is_annotated package. The changes update the package metadata and CI testing matrix to include Python 3.14 while maintaining the existing minimum version requirement of Python 3.9.

• Added Python 3.14 classifier to package metadata
• Updated CI test matrix to test on Python 3.9 and 3.14 (minimum and maximum supported versions)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Added Programming Language :: Python :: 3.14 classifier to indicate official support
.github/workflows/ci.yml	Updated test matrix from ["3.9", "3.13"] to ["3.9", "3.14"] to test on minimum and maximum supported versions

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