Part of v2.105 upgrade is it introduces the XML v1.1 support, but unfortunately we have to rollback due to the maven project hanging issue in JENKINS-49375.

When we tried to do the rollback on the UI, it shows the error screen:

One workaround solution is to directly edit that config.xml to make change
from `<?xml version='1.1' encoding='UTF-8'?>`
to `<?xml version='1.0' encoding='UTF-8'?>` 

I wonder if we have more cleaner way to fix this issue.