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

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https://hg.mozilla.org/integration/gaia-central/rev/fa94275bff25
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21229 from vingtetun/bug1031524

Bug 1031524 - Search Engine based on MNC/MCC in browser.json is not incl...

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https://hg.mozilla.org/integration/gaia-central/rev/444af5b4f131
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1031524 - Search Engine based on MNC/MCC in browser.json is not included in the Settings -> Homescreen -> Search Engine. r=benfrancis
Bumping manifests a=b2g-bump