Update tox requirement from ~=4.17.1 to ~=4.21.2 #882

	name: 🧱 Build

	on:
	push:
	branches:
	- mainline
	pull_request:
	schedule:
	- cron: "0 07 * * FRI"

	jobs:
	build_wheels:
	name: Build for Python ${{ matrix.python }} on ${{ matrix.os }}
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-22.04, windows-2019, macos-11]
	python: ['3.7', '3.8', '3.9', '3.10']

	steps:
	- name: Checkout Repository
	uses: actions/checkout@v3
	with:
	submodules: true
	fetch-depth: 0

	- name: Install Python
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python }}

	- name: Install pip
	run: pip install --upgrade pip

	- name: Install Python packages
	run: pip install --upgrade build twine

	- name: Build wheels
	run: python -m build

	- name: Check PyPI description
	run: python -m twine check dist/*

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