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

========

https://hg.mozilla.org/integration/gaia-central/rev/3debae792d20
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #17769 from gaye/bug-987355

Bug 987355 - Migrate month_view_test.js to use new view code r=millermedeiros

========

https://hg.mozilla.org/integration/gaia-central/rev/ad73138f9718
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug 987355 - Migrate month_view_test.js to use new view code
Bumping manifests a=b2g-bump