Fix implicit nullables #241

Job	Run time
Linter / yaml-linter	6s
PHP-Linter (8.2) / linter	9s
Linter / json-linter	22s
PHP-Linter (8.1) / linter	13s
Linter / ecmascript-linter	0s
PHP-Linter (8.4) / linter	12s
PHP-Linter (8.3) / linter	16s
Linter / style-linter	0s
Unit tests, PHP 8.2, windows-latest	1m 16s
Unit tests, PHP 8.1, ubuntu-latest	24s
Unit tests, PHP 8.2, ubuntu-latest	31s
Unit tests, PHP 8.1, windows-latest	1m 5s
Unit tests, PHP 8.4, windows-latest	1m 9s
Unit tests, PHP 8.3, windows-latest	1m 7s
Unit tests, PHP 8.3, ubuntu-latest	28s
Unit tests, PHP 8.4, ubuntu-latest	20s
Quality control	41s
Code coverage	8s
Security checks	26s
Cleanup artifacts	6s
	8m 59s

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