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

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https://hg.mozilla.org/integration/gaia-central/rev/7ad9ed1cd610
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23120 from KevinGrandon/bug_1053265_search_landscape_support

Bug 1053265 - [Search] Landscape support

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https://hg.mozilla.org/integration/gaia-central/rev/3abfdf727dab
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1053265 - [Search] Landscape support r=etienne r=daleharvey
Bumping manifests a=b2g-bump