Fix phpstan errors #10919

Job	Run time
static-code-analysis-php / static-analysis-php	1m 4s
tests-unit-php (8.2) / tests-unit-php	38s
tests-unit-php (7.4) / tests-unit-php	32s
tests-unit-php (8.3) / tests-unit-php	34s
tests-unit-php (8.4) / tests-unit-php	40s
coding-standards-analysis-php / coding-standards-php	1m 3s
tests-unit-php (8.1) / tests-unit-php	34s
tests-unit-php (8.0) / tests-unit-php	33s
	5m 38s

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