Fix issues with new slevomat rules #399

Job	Run time
Security checks	20s
Quality control	34s
Linter / yaml-linter	5s
Linter / json-linter	28s
PHP-Linter (8.3) / linter	10s
PHP-Linter (8.2) / linter	11s
PHP-Linter (8.4) / linter	9s
Linter / style-linter	0s
Linter / ecmascript-linter	-1s
Unit tests, PHP 8.3, ubuntu-latest	32s
Unit tests, PHP 8.4, windows-latest	59s
Unit tests, PHP 8.2, windows-latest	1m 7s
Unit tests, PHP 8.2, ubuntu-latest	26s
Unit tests, PHP 8.3, windows-latest	1m 1s
Unit tests, PHP 8.4, ubuntu-latest	29s
Code coverage	7s
Cleanup artifacts	3s
	6m 40s

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