Test Python 3.13

[isaaccorley]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for Python 3.13 to the project by updating the version constraints and test matrix.

• Updates the Python version requirement to allow Python 3.13
• Adds Python 3.13 to the classifiers and CI test matrix
• Changes the default Python version in the pytest workflow to 3.13

Reviewed Changes

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

File	Description
pyproject.toml	Updates Python version constraints and adds 3.13 classifier
.github/workflows/pytest.yml	Adds 3.13 to test matrix and updates default version

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