See JENKINS-35522 and JENKINS-35525 for typical changes
Cannot add credentials despite having permissions inside a Folder
Credentials dropdowns empty when configuring external libraries at the global level
CloudBees Internal OSS-1625
Isn't this done now? I see the current subversion plugin release requires credentials 2.1.4. Is there more work that needs to be done to take advantage of additional features?
Yes it is not just a dep update but use of new APIs.