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

========

https://hg.mozilla.org/integration/gaia-central/rev/2e9089cee3c4
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #19367 from luke-chang/1012556_stingray_cant_launch_app

Bug 1012556 - [Stingray] Can't launch apps from App List, r=johnhu

========

https://hg.mozilla.org/integration/gaia-central/rev/4275f51da53a
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1012556 - [Stingray] Can't launch apps from App List
Bumping manifests a=b2g-bump