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

========

https://hg.mozilla.org/integration/gaia-central/rev/8e359c1f4fef
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14668 from pivanov/bug-946625

Bug 946625 - [Settings - Email Settings] Toggles have incorrect right margin

========

https://hg.mozilla.org/integration/gaia-central/rev/21246f8af939
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 946625 - [Settings - Email Settings] Toggles have incorrect right margin