Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/30ed848ece50
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14503 from viorelaioia/bug_942107_settings

Bug 942107 - Reduce locators, settings app

========

https://hg.mozilla.org/integration/gaia-central/rev/e912a1a1c349
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Reduce locators, settings app
Bumping manifests a=b2g-bump