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

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https://hg.mozilla.org/integration/gaia-central/rev/f20ae4aa0850
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18848 from KevinGrandon/bug_1003960_home2_search_bridge

Bug 1003960 - [Home2] Search Integration

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https://hg.mozilla.org/integration/gaia-central/rev/99248a0b036b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1003960 - [Home2] Search Integration r=benfrancis
Bumping manifests a=b2g-bump