The plugin is using DatatypeConverter for some hex conversion, it should be replaced by code not coming from JAXB (https://github.com/jenkinsci/scm-api-plugin/blob/d66c700f094576d1d8ab290482d505555d963105/src/test/java/jenkins/scm/impl/mock/MockSCMController.java#L604)
 

Acceptance criteria

https://github.com/jenkinsci/scm-api-plugin/search?q=javax.xml.bind&unscoped_q=javax.xml.bind yields nothing anymore