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

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https://hg.mozilla.org/integration/gaia-central/rev/4caf1d14a3bd
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16248 from viorelaioia/bug-968912

Bug 968912 - Make an app object for FTU

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https://hg.mozilla.org/integration/gaia-central/rev/077690350b64
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 968912 - Make an app object for FTU and write a test for desktopb2g/CI
Bumping manifests a=b2g-bump