Bump actions/cache from 3 to 4 #56

	---
	name: CI

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main
	workflow_dispatch:

	jobs:
	tox:
	name: ${{ matrix.toxenv }}
	runs-on: ubuntu-latest
	env:
	TOXENV: ${{ matrix.toxenv }}

	strategy:
	fail-fast: false
	matrix:
	toxenv:
	- py312,test-coverage
	- lint
	- mypy

	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.12"
	- name: Generate the cache suffix
	id: cache-suffix
	run: \|
	echo cache-suffix=${TOXENV//,/-} >> $GITHUB_OUTPUT
	- uses: actions/cache@v4
	with:
	path: \|
	~/.cache/pip
	~/.cache/pre-commit
	.mypy_cache
	key: ${{ runner.os }}-pip-${{ steps.cache-suffix.outputs.cache-suffix }}
	- name: Install dependencies
	run: \|
	set -xe
	python -VV
	python -m pip install --upgrade pip setuptools wheel
	python -m pip install --upgrade virtualenv tox
	- name: tox
	run: python -m tox

	pip-compile:
	name: pip-compile
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.12"
	- uses: actions/cache@v4
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-compile
	- name: Install dependencies
	run: \|
	set -xe
	python -VV
	python -m pip install --upgrade pip setuptools wheel
	python -m pip install --upgrade virtualenv tox
	- name: tox
	# Verify requirements.txt is up to date
	run: python -m tox -e pip-compile && git diff --exit-code

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