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

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https://hg.mozilla.org/integration/gaia-central/rev/0c81040a119d
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #19645 from EverythingMe/home2-collection-icon-master

Bug 1016204 - [Collections App] Collection icons for vertical homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/b7963661d0ca
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1016204 - [Collections App] Collection icons for vertical homescreen [r=ranbena, kgrandon]
Bumping manifests a=b2g-bump