Migrate DOM-classes to PHP 8.4's new DOM-API #1409

Job	Run time
PHP-Linter (8.5) / linter	10s
Linter / json-linter	26s
Linter / yaml-linter	5s
Linter / style-linter	-1s
Linter / ecmascript-linter	-1s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	-1s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	-1s
Code coverage	-1s
Quality control	-1s
Cleanup artifacts	0s
Security checks	-1s
	34s

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