Bump actions/checkout from 3 to 4 #1260

	name: Build and Test Bandit

	on: [push, pull_request]

	jobs:
	format:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8]
	steps:
	- name: Checkout repository
	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 tox
	- name: Run tox
	run: tox run -e format

	pep8:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8]
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 2
	- 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 tox
	- name: Run tox
	run: tox run -e pep8

	tests:
	strategy:
	matrix:
	python-version: [
	["3.8", "38"], ["3.9", "39"], ["3.10", "310"], ["3.11", "311"]
	]
	os: [ubuntu-latest, macos-latest]
	runs-on: ${{ matrix.os }}
	name: ${{ matrix.os }} (${{ matrix.python-version[0] }})
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version[0] }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version[0] }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install tox
	- name: Run tox
	run: tox run -e py${{ matrix.python-version[1] }}

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