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

========

https://hg.mozilla.org/integration/gaia-central/rev/bb76b28d5e60
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #21107 from zacc/bug_1030781

Bug 1030781 - Refactor Python camera app object

========

https://hg.mozilla.org/integration/gaia-central/rev/3e34e4012530
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1030781 - Refactor Python camera app object
Bumping manifests a=b2g-bump