updates the Makefile to ensure consistent installations of black and click. #2408

	name: Black
	on: [push,pull_request]
	jobs:
	build:
	if: github.event_name != 'pull_request' \|\| github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: [3.8]

	steps:
	# git checkout
	- uses: actions/checkout@v3

	# python setup
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	cache: pip

	# install black (extract version from versions.cfg)
	- name: install black
	run: pip install click==$(awk '/^click =/{print $NF}' versions.cfg) black==$(awk '/^black =/{print $NF}' versions.cfg)

	# run black
	- name: run black
	run: black src/ --check --diff

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