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

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https://hg.mozilla.org/integration/gaia-central/rev/eaf45145b8f2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14996 from KevinGrandon/bug_956076_dont_show_rocketbar_on_utility_tray_hide

Bug 956076 - [Rocketbar] Is shown when a user dismisses the utility tray r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/8cf12e26184b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 956076 - [Rocketbar] Is shown when a user dismisses the utility tray