Update workflow actions. #123

	name: Python matrix CI

	on: [push]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python-version: ['3.10', '3.11', '3.12']
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Display Python version
	run: python -c "import sys; print(sys.version)"
	- name: Install poetry
	run: \|
	python3 -m pip install poetry
	poetry install
	- name: Test with pytest
	run: \|
	poetry run pytest --cov=blint tests
	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	poetry run flake8 . --count --exit-zero --statistics

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