Bump phpstan/phpstan from 1.12.4 to 1.12.7 #179

Job	Run time
Debug	1s
Check files / Changed	18s
XML Syntax	0s
Code-QL / Analyze (javascript)	1m 20s
Composer / Validation	8s
PHPStan / Analyze (ubuntu-latest, 8.1)	3m 17s
PHP CS Fixer / Validation	3m 57s
PHPStan / Analyze (ubuntu-latest, 8.3)	2m 45s
PHP CS / Default	4m 25s
PHP CS / Ecg	2m 17s
PHP CS / PhpCompatibility	6m 24s
PHP Syntax	0s
Unit Tests (OpenMage)	0s
Unit Tests (Sonar)	0s
	24m 52s

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