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

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https://hg.mozilla.org/integration/gaia-central/rev/41b6c1ae6829
Author: Evelyn Eastmond <evhan55@gmail.com>
Desc: Bug 959661 - [Messages][Drafts] Only set MessageManager draft if not in thread (to thread's draft, or null if thread has no draft) r=rwaldron
Bumping manifests a=b2g-bump