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

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https://hg.mozilla.org/integration/gaia-central/rev/36c70855bae2
Author: Ran Ben Aharon <ran@everything.me>
Desc: Merge pull request #12493 from EverythingMe/921100-collections

Bug 921100 - [Homescreen] Update homescreen to default for 4 smart collections only [r=crdlc]

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https://hg.mozilla.org/integration/gaia-central/rev/fa632c3a8a8c
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 921100 - [Homescreen] Update homescreen to default for 4 smart collections only [r=crdlc]