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

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https://hg.mozilla.org/integration/gaia-central/rev/20cccc8cefa6
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22436 from KevinGrandon/bug_1045701_smart_collection_icon_build_master

Bug 1045701 - Part 1 [Collection App] - Use proper icon regardless of device size

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https://hg.mozilla.org/integration/gaia-central/rev/ffcac71067d3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1045701 - Part 1 [Collection App] - Use proper icon regardless of device size r=yurenju
Bumping manifests a=b2g-bump