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

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https://hg.mozilla.org/integration/gaia-central/rev/25b1202568a3
Author: Nikhil Marathe <nsm.nikhil@gmail.com>
Desc: Bug 1062323 - Fix compose_test.js for Promise change. r=julien
Bumping manifests a=b2g-bump