Bump actions/checkout from 3 to 4 #151

	name: Documentation Checks

	on: push

	jobs:
	build:
	strategy:
	max-parallel: 4
	matrix:
	os: [ubuntu-latest]
	python-version: [3.9]

	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r docs/requirements.txt
	- name: Test building docs
	run: mkdocs build

Provide feedback