Update actions/checkout action to v4 #942

	name: "Mutation tests"

	on:
	pull_request:
	push:

	jobs:
	mutation-tests:
	name: "Mutation tests"

	runs-on: ${{ matrix.operating-system }}

	strategy:
	matrix:
	dependencies:
	- "locked"
	php-version:
	- "8.1"
	operating-system:
	- "ubuntu-latest"

	steps:
	- name: "Checkout"
	uses: "actions/checkout@v4"

	- name: "Install PHP"
	uses: "shivammathur/setup-php@v2"
	with:
	coverage: "xdebug"
	php-version: "${{ matrix.php-version }}"
	ini-values: memory_limit=-1
	tools: composer:v2, cs2pr

	- name: Get composer cache directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"

	- name: "Cache dependencies"
	uses: "actions/[email protected]"
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}"
	restore-keys: "php-${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"

	- name: "Install lowest dependencies"
	if: ${{ matrix.dependencies == 'lowest' }}
	run: "composer update --prefer-lowest --no-interaction --no-progress"

	- name: "Install highest dependencies"
	if: ${{ matrix.dependencies == 'highest' }}
	run: "composer update --no-interaction --no-progress"

	- name: "Install locked dependencies"
	if: ${{ matrix.dependencies == 'locked' }}
	run: "composer install --no-interaction --no-progress"

	- name: "Infection"
	run: "make infection PHPUNIT_FLAGS=--coverage-clover=coverage.xml INFECTION_FLAGS=--logger-github"

	- name: "Upload Code Coverage"
	uses: "codecov/[email protected]"

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