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

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https://hg.mozilla.org/integration/gaia-central/rev/93cb2a62688e
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #16262 from benfrancis/959694-master

Bug 959694 - Combine Rocketbar and statusbar r=kgrandon r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/1bb84bb99be9
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 959694 - Combine Rocketbar and statusbar
Bumping manifests a=b2g-bump