Prevent spec from publishing in Maven Central

[jim-krueger]

See: https://search.maven.org/classic/#search%7Cga%7C1%7Cg%3A%22jakarta.xml.registry%22

For version 1.0.10 the xml-registries-spec was published to Maven Central. While this likely cannot be removed, we should not publish future releases so it is important to determine why this happened and prevent it in the future.