Fix PHPStan level 7 errors #2877

Job	Run time
Dependency Validation	13s
Coding Guidelines	32s
Static Analysis	30s
Unit Tests (ubuntu-latest, 8.3)	14s
Unit Tests (ubuntu-latest, 8.4)	11s
Unit Tests (ubuntu-latest, 8.5)	12s
Unit Tests (windows-latest, 8.3)	37s
Unit Tests (windows-latest, 8.4)	39s
Unit Tests (windows-latest, 8.5)	33s
End-to-End Tests (ubuntu-latest, 8.3)	43s
End-to-End Tests (ubuntu-latest, 8.4)	41s
End-to-End Tests (ubuntu-latest, 8.5)	42s
End-to-End Tests (windows-latest, 8.3)	1m 40s
End-to-End Tests (windows-latest, 8.4)	1m 41s
End-to-End Tests (windows-latest, 8.5)	1m 42s
Code Coverage	2m 23s
Build PHAR	32s
Test PHAR (8.3, pcov)	16s
Test PHAR (8.3, xdebug)	29s
Test PHAR (8.4, pcov)	15s
Test PHAR (8.4, xdebug)	30s
Test PHAR (8.5, pcov)	15s
Test PHAR (8.5, xdebug)	33s
	16m 3s

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