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

========

https://hg.mozilla.org/integration/gaia-central/rev/b40661a27b48
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #14814 from eeejay/bug-940633

Bug 940633 - [Cost Control] Fix alignment of checkboxes in usage tab.

========

https://hg.mozilla.org/integration/gaia-central/rev/5ab9c7e045d0
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 940633 - [Cost Control] Fix alignment of checkboxes in usage tab.