[php-src] Issue #8038: DOM extension reflection version is incorrect

Issue: https://github.com/php/php-src/issues/8038 Author: AndrolGenhald ### Description Getting the DOM extension version from the reflection API results in "20031129" no matter which PHP version is used: https://3v4l.org/VIJKY I would expect it to behave like other bundled extensions and track the PHP version: https://3v4l.org/iNi1B The following code: ```php <?php $domExtReflection = new ReflectionExtension("dom"); var_dump($domExtReflection->getVersion()); ``` Resulted in this output: ``` string(8) "20031129" ``` But I expected this output instead: ``` string(5) "8.1.2" ``` ### PHP Version 8.1.2 ### Operating System _No response_