PHPCS: ignore `mcrypt` related warnings #4720

Job	Run time
Debug	1s
Check files / Changed	17s
Code-QL	0s
Composer / Validation	13s
XML Syntax / XML Validation	17s
PHP CS Fixer / Validation	2m 50s
PHP CS / Default	4m 17s
PHP CS / Ecg	2m 11s
PHPStan / Analyze (ubuntu-latest, 7.4)	4m 55s
PHP CS / PhpCompatibility	5m 42s
PHPStan / Analyze (ubuntu-latest, 8.3)	2m 44s
PHP Syntax	0s
Unit Tests (Sonar)	0s
Unit Tests (OpenMage)	0s
	23m 27s

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