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

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https://hg.mozilla.org/integration/gaia-central/rev/f7dd70f6731a
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #23724 from benfrancis/1062329

Bug 1062329 - Active state for Rocketbar windows button r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/928bfc3077b7
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1062329 - Active state for Rocketbar windows button
Bumping manifests a=b2g-bump