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

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https://hg.mozilla.org/integration/gaia-central/rev/babf9d902c9d
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #10767 from samjoch/bug-878851-UpdateStatusBarAlphanumericIconsToUseFeuraSans

Bug 878851 - Update status bar alphanumeric icons to use Feura Sans r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/5b1561082afd
Author: Sam Joch <samuel@guiora.com>
Desc: Bug 878851 - Update status bar alphanumeric icons to use Feura Sans