Fix phpstan and remove unnecessary baseline #248

Job	Run time
PHP-Linter (8.4) / linter	11s
PHP-Linter (8.5) / linter	13s
PHP-Linter (8.3) / linter	13s
Linter / yaml-linter	6s
Linter / json-linter	29s
Linter / style-linter	-1s
Linter / ecmascript-linter	-1s
Unit tests, PHP 8.5, windows-latest	1m 14s
Unit tests, PHP 8.5, ubuntu-latest	17s
Unit tests, PHP 8.4, ubuntu-latest	19s
Unit tests, PHP 8.3, ubuntu-latest	23s
Unit tests, PHP 8.4, windows-latest	1m 19s
Unit tests, PHP 8.3, windows-latest	1m 15s
Security checks	28s
Quality control	38s
Code coverage	14s
Cleanup artifacts	3s
	7m 20s

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