Closes #855 Support Python 3.13 in the library

[shirasassoon]

This pull request adds Python 3.13 support and updates type annotations throughout the codebase for better compatibility and clarity. The most significant changes include updating the supported Python versions in the project configuration and CI, and standardizing type hints to use Optional and Union for improved readability and future compatibility.

Python version support:

• Updated pyproject.toml to support Python 3.13 by changing requires-python to >=3.9,<3.14 and adding the appropriate classifier. [1] [2]
• Modified the GitHub Actions workflow (.github/workflows/test.yml) to run unit tests against Python 3.9 through 3.13 and updated the used action versions.

Type annotation improvements:

• Refactored type hints across multiple modules to use Optional and Union instead of the Python 3.10+ syntax (|), improving compatibility and clarity. This includes changes in _common/_config_utils.py, _common/_config_validator.py, _common/_fabric_endpoint.py, and _common/_logging.py. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

[Copilot]

Pull request overview

This PR adds Python 3.13 support by updating the version requirement to >=3.9,<3.14 and fixing type annotations throughout the codebase that used PEP 604 union syntax (X | Y), which requires Python 3.10+. All such annotations are replaced with Optional[X] and Union[X, Y] from the typing module, ensuring backward compatibility with Python 3.9.

Changes:

• Updated Python version range and classifier in pyproject.toml, and uv.lock with Python 3.13 dependency wheels
• Updated CI workflow to test against Python 3.9–3.13 as a matrix and upgraded action versions to checkout@v4 / setup-python@v5
• Replaced PEP 604 X | Y type annotation syntax with Optional[X]/Union[X, Y] in _config_utils.py, _config_validator.py, _fabric_endpoint.py, and _logging.py

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Bumps requires-python to <3.14 and adds Python 3.13 classifier
uv.lock	Adds cp313 wheel entries for cffi, charset-normalizer, coverage, MarkupSafe, pywin32, PyYAML, regex, tomli, and watchdog
.github/workflows/test.yml	Adds Python version matrix (3.9–3.13), upgrades actions/checkout to v4 and actions/setup-python to v5
src/fabric_cicd/_common/_config_utils.py	Replaces str | list | bool | None return type with Optional[Union[str, list, bool]]
src/fabric_cicd/_common/_config_validator.py	Replaces dict | list and str | dict parameter types with Union[dict, list] and Union[str, dict]
src/fabric_cicd/_common/_fabric_endpoint.py	Replaces int | None and float | None parameter types with Optional[int] and Optional[float]
src/fabric_cicd/_common/_logging.py	Replaces logging.FileHandler | RotatingFileHandler with Union[logging.FileHandler, RotatingFileHandler]
.changes/unreleased/optimization-20260308-092252.yaml	Adds changelog entry for Python 3.13 support