Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/86c810249c10
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 847337 - Do not wait for l10n to be ready before running initialization code r=julienw