Fixed some php8 issues #706

Job	Run time
PHP linter (7.1)	13s
PHP linter (7.2)	13s
PHP linter (7.3)	13s
PHP linter (7.4)	24s
PHP linter (8)	16s
PHP linter (8.1)	12s
PHP linter (8.2)	13s
Code quality checks (8.2, composer test:phpstan)	33s
PHPCompatibility (7.1)	25s
Check code style (8.2, .Build/bin/php-cs-fixer fix --diff --dry-run)	24s
PHPCompatibility (7.2)	32s
PHPUnit (^8.7, 7.1)	24s
PHPCompatibility (7.3)	16s
PHPCompatibility (7.4)	25s
PHPCompatibility (8.0)	17s
PHPUnit (^8.7, 7.2)	31s
PHPCompatibility (8.1)	17s
PHPCompatibility (8.2)	29s
PHPUnit (^9.5, 7.2)	36s
PHPUnit (^9.5, 7.3)	21s
PHPUnit (^9.5, 7.4)	21s
PHPUnit (^10.4, 7.2)	29s
PHPUnit (^10.4, 7.3)	24s
PHPUnit (^10.4, 7.4)	21s
PHPUnit (^11.5, 8)	23s
PHPUnit (^11.5, 8.1)	21s
PHPUnit (^11.5, 8.2)	22s
PHPUnit (^12.4, 8.1)	31s
PHPUnit (^12.4, 8.2)	20s
	10m 46s

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