Remove unused `java.xml` dependency from `module-info.java`

[derTobsch]

The module descriptor currently declares a dependency on java.xml, but this module is not actually used anywhere in the codebase.

Keeping unused module dependencies increases maintenance overhead and may introduce unnecessary coupling. Since there are no imports or usages of the java.xml API in the project, the dependency can safely be removed.

Current state

module-info.java contains:

requires java.xml;

However, there are no references to classes from the java.xml module (e.g., javax.xml.*, org.w3c.dom.*, org.xml.sax.*, etc.) in the codebase.

[derTobsch]

java.xml is used ion tests, and we do not have a test module-info.java that is why it is in the module info for production code.