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

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https://hg.mozilla.org/integration/gaia-central/rev/f61e3ad3c2b2
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #19670 from EverythingMe/home2-pinned-apps

Bug 1016234 - [Collections App] Pinning apps to Collection

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https://hg.mozilla.org/integration/gaia-central/rev/4525ee03e184
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1016234 - [Collections App] Pinning apps to Collection [r=kgrandon]
Bumping manifests a=b2g-bump