Fix PHPStan level 7 errors #2918

Job	Run time
Dependency Validation	11s
Coding Guidelines	30s
Static Analysis	29s
Unit Tests (ubuntu-latest, 8.3)	11s
Unit Tests (ubuntu-latest, 8.4)	9s
Unit Tests (ubuntu-latest, 8.5)	15s
Unit Tests (windows-latest, 8.3)	31s
Unit Tests (windows-latest, 8.4)	37s
Unit Tests (windows-latest, 8.5)	36s
End-to-End Tests (ubuntu-latest, 8.3)	42s
End-to-End Tests (ubuntu-latest, 8.4)	43s
End-to-End Tests (ubuntu-latest, 8.5)	44s
End-to-End Tests (windows-latest, 8.3)	1m 37s
End-to-End Tests (windows-latest, 8.4)	1m 37s
End-to-End Tests (windows-latest, 8.5)	1m 39s
Code Coverage	2m 23s
Build PHAR	31s
Test PHAR (8.3, pcov)	16s
Test PHAR (8.3, xdebug)	29s
Test PHAR (8.4, pcov)	28s
Test PHAR (8.4, xdebug)	30s
Test PHAR (8.5, pcov)	16s
Test PHAR (8.5, xdebug)	33s
	15m 57s

Provide feedback