Bump actions/cache from 3 to 4 #184

Job	Run time
Debug	1s
Check files / Changed	12s
XML Syntax	0s
Composer / Validation	13s
Code-QL / Analyze (javascript)	1m 38s
PHP CS Fixer / Validation	4m 8s
PHPStan / Analyze (ubuntu-latest, 7.4)	3m 32s
PHP CS / Default	4m 45s
PHPStan / Analyze (ubuntu-latest, 8.4)	3m 15s
PHP CS / Ecg	2m 19s
PHP CS / PhpCompatibility	6m 29s
Unit Tests (OpenMage)	0s
PHP Syntax	0s
Rector	0s
	26m 32s

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