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

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https://hg.mozilla.org/integration/gaia-central/rev/e3766b290f72
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20729 from KevinGrandon/bug_1022985_collections_insertion_2

Bug 1026273 - [Vertical Homescreen] Smart collections are sometimes added in a random order

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https://hg.mozilla.org/integration/gaia-central/rev/ff4439efa88a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1026273 - [Vertical Homescreen] Smart collections are sometimes added in a random order
Bumping manifests a=b2g-bump