pyproject.toml: move build-system info to the corresponding place #3

	name: tests and quality targets

	on: push

	jobs:
	build:
	name: tests
	runs-on: ubuntu-latest

	strategy:
	matrix:
	version: ["3.8", "3.9", "3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.version }}
	- name: Install dependencies
	run: \|
	pip install --upgrade pip setuptools wheel
	pip install tox
	- name: Run tox
	run: tox

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