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

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https://hg.mozilla.org/integration/gaia-central/rev/854db39fc09e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22277 from KevinGrandon/bug_1045758_combine_rocketbars

Bug 1045758 - [Rocketbar] Haida cleanup and home search rollup

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https://hg.mozilla.org/integration/gaia-central/rev/6c14238e51bf
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1045758 - [Rocketbar] Haida cleanup and home search rollup r=vingtetun
Bumping manifests a=b2g-bump