Update supported Python versions to include 3.13, remove 3.7 and 3.8

[JasonWeill]

Problem

Per https://devguide.python.org/versions/, on 2024-10-07, Python 3.13 was officially released, and Python 3.7 and 3.8 are now end of life (EOL). The pyproject.toml file mentions 3.7 and 3.8, but does not mention 3.12.

Proposed Solution

Test this extension with Python 3.13. Add support for 3.13 and remove 3.7 and 3.8 as supported Python versions.