Update git submodules
- Update extensions/Wikibase from branch 'wmf/1.31.0-wmf.7'
- Swap submodules to Phabricator instead of Github
We can't deploy from Github, so use Phabricator which will observe Github and keep in sync.
Change-Id: I7b1e3cbafc4a936d4bbda05e6831b248f5f6440f (cherry picked from commit 2edbce09c29b6ca33b8f5c05f7e98613e5c647cf)
- Swap submodules to Phabricator instead of Github