Update artifact version from v2 to v4 #616

	name: Tests

	on: [push]

	jobs:

	test:
	strategy:
	matrix:
	os: [ubuntu-latest]
	python-version: [3.9, '3.10']
	max-parallel: 4
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v2

	- name: Set up Python ${{ matrix.python-version }} on ${{ matrix.os }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install Poetry
	uses: snok/install-poetry@v1
	with:
	version: latest
	virtualenvs-create: true
	virtualenvs-in-project: true

	- name: Install Dependencies
	run: poetry install
	if: steps.cache.outputs.cache-hit != 'true'

	- name: Install Graphviz dependency
	run: sudo apt install graphviz

	- name: Test
	run: \|
	make test
	poetry run coverage report -m

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