Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/f87acdc6f3b0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1025499 - [Search] Intermittent failure, Vertical - Search Search for app r=daleharvey
Bumping manifests a=b2g-bump