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

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https://hg.mozilla.org/integration/gaia-central/rev/dfe12821b6b8
Author: Rudy Lu <left.lu@gmail.com>
Desc: Merge pull request #10562 from RudyLu/settings/Bug886242-not_to_highlight_disabled_menuItem

Bug 886242 - fix the style for disabled menu item in settings. r=arthur.

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https://hg.mozilla.org/integration/gaia-central/rev/8b8ba0a0bd86
Author: Rudy Lu <left.lu@gmail.com>
Desc: Bug 886242 - fix the style for disabled menu item in settings