Drop support for python 3.8 and add 3.13 support

[sanders41]

Pull Request

Python 3.8 is EOL and Python 3.13 has been released. Support for Python 3.8 has been removed from a lot of the packages we use and this is causing the dependabot updates to fail.

Related issue

Fixes #<issue_number>

What does this PR do?

• Drops support for Python 3.8
• Adds support for Python 3.13

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• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
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