The top level POM (src/pom.xml) has this:
Some discussion with Jody on the ML indicates that we probably don't want that snapshots part. Snapshots should come from the Boundless repo (which we already have enabled).
It should be good enough that it builds, unless I'm missing something
Are you going to make a pull request?
I do plan a PR, but wanted to do some more tests after the repositories settle. Expect a few more days.
Maybe not that many more days. PR at https://github.com/geoserver/geoserver/pull/1249
Mass closing all resolved issues not modified in the last 4 weeks