tests

Add support for PHP CS Fixer running in parallel #228

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Run time

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Job	Run time
PHP 8.2 - ubuntu-22.04	1m 11s
PHP 8.3 - ubuntu-22.04	45s
PHP 8.2 - windows-2019	1m 26s
PHP 8.3 - windows-2019	1m 23s
	4m 45s