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

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https://hg.mozilla.org/integration/gaia-central/rev/cef9227e91d0
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #13929 from vingtetun/bug941950

Bug 941950 - Prevent a click to fire when the home button is pressed on ...

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https://hg.mozilla.org/integration/gaia-central/rev/1dd3ca86989a
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 941950 - Prevent a click to fire when the home button is pressed on some devices. r=alive