Add Python 3.14 to CI test matrix

[sridharswain]

Description

pyproject.toml declares Python 3.14 as a supported version:

requires-python = ">=3.10,<4.0"
classifiers = [
    ...
    "Programming Language :: Python :: 3.14",
]

However, .github/workflows/ci.yml only tests against 3.10, 3.11, 3.12, 3.13:

matrix:
  python-version: ["3.10", "3.11", "3.12", "3.13"]

Suggested Fix

Add "3.14" to the CI matrix to match the declared support, or remove the 3.14 classifier from pyproject.toml if it's not yet supported.

[nightcityblade]

Hi, I'd like to work on this. I'll submit a PR shortly.