Bump actions/checkout from 3 to 4 #22

	name: Lint

	on:
	push:
	branches: [ master ]
	pull_request:
	types: [ opened, reopened, synchronize ]

	jobs:
	lint:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: Setup Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.8

	- name: Restore cache
	uses: actions/cache@v3
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-${{ hashFiles('requirements*') }}

	- name: Install dependencies
	run: \|
	python3 -m pip install --upgrade pip wheel
	python3 -m pip install --upgrade --upgrade-strategy eager flake8

	- name: Run flake8
	run: \|
	flake8 .

Provide feedback