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

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https://hg.mozilla.org/integration/gaia-1_4/rev/2248f862d114
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 985369 - Drop updates to the suggestions that have already been superseded

(cherry picked from commit b4d080e6dc8840190adf10e137361ca9af567cb8)
Bumping manifests a=b2g-bump