Fix PHPStan level 7 errors #2876

Job	Run time
Coding Guidelines	30s
Dependency Validation	9s
Static Analysis	34s
Unit Tests (ubuntu-latest, 8.3)	12s
Unit Tests (ubuntu-latest, 8.4)	12s
Unit Tests (ubuntu-latest, 8.5)	12s
Unit Tests (windows-latest, 8.3)	31s
Unit Tests (windows-latest, 8.4)	34s
Unit Tests (windows-latest, 8.5)	32s
End-to-End Tests (ubuntu-latest, 8.3)	37s
End-to-End Tests (ubuntu-latest, 8.4)	42s
End-to-End Tests (ubuntu-latest, 8.5)	40s
End-to-End Tests (windows-latest, 8.3)	1m 37s
End-to-End Tests (windows-latest, 8.4)	1m 42s
End-to-End Tests (windows-latest, 8.5)	1m 38s
Build PHAR	26s
Code Coverage	2m 20s
Test PHAR (8.3, pcov)	16s
Test PHAR (8.3, xdebug)	28s
Test PHAR (8.4, pcov)	20s
Test PHAR (8.4, xdebug)	45s
Test PHAR (8.5, pcov)	17s
Test PHAR (8.5, xdebug)	34s
	15m 48s

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