Update dependency squizlabs/php_codesniffer to v4 #236

	name: PHP Coding Style Checker

	on:
	push:
	branches:
	- '*'
	pull_request:
	branches:
	- '*'

	jobs:

	phpcs:
	name: phpcs check codestyles
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Setup PHP Action
	uses: shivammathur/setup-php@v2
	with:
	php-version: 7.4
	extensions: dom, mbstring
	coverage: none
	tools: 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/cache@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
	restore-keys: ${{ runner.os }}-composer-

	- name: Install Dependencies
	run: composer install --prefer-dist --no-progress --no-suggest

	- name: Run phpcs
	run: vendor/bin/phpcs --standard=./phpcs.xml --report=checkstyle -q ./src ./tests \| cs2pr

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