Fix PHPStan level 7 errors #2917

Job	Run time
Coding Guidelines	31s
Dependency Validation	9s
Static Analysis	30s
Unit Tests (ubuntu-latest, 8.3)	10s
Unit Tests (ubuntu-latest, 8.4)	10s
Unit Tests (ubuntu-latest, 8.5)	11s
Unit Tests (windows-latest, 8.3)	34s
Unit Tests (windows-latest, 8.4)	36s
Unit Tests (windows-latest, 8.5)	33s
End-to-End Tests (ubuntu-latest, 8.3)	40s
End-to-End Tests (ubuntu-latest, 8.4)	40s
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 53s
End-to-End Tests (windows-latest, 8.5)	1m 51s
Build PHAR	25s
Code Coverage	2m 24s
Test PHAR (8.3, pcov)	16s
Test PHAR (8.3, xdebug)	33s
Test PHAR (8.4, pcov)	15s
Test PHAR (8.4, xdebug)	28s
Test PHAR (8.5, pcov)	18s
Test PHAR (8.5, xdebug)	30s
	15m 58s

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