preliminary 3.13 support #38

	`---
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	name: Validate
	on: push

	jobs:
	validate:
	name: Syntax check all code in repository
	runs-on: ubuntu-latest

	strategy:
	matrix:
	python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13.0-rc.2']

	steps:
	- uses: actions/checkout@v4
	with:
	ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
	submodules: true

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}

	- name: Test
	run: \|
	python3 -m pip install -U pip;
	python3 -m pip install .;

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