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

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https://hg.mozilla.org/integration/gaia-central/rev/796d5bddde1f
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #12752 from arcturus/bug-914191-1

Bug 914191 - [Contacts] Import contacts from SD card make phone not enter sleep.

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https://hg.mozilla.org/integration/gaia-central/rev/22cfa510129c
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 914191 - [Contacts] Import contacts from SD card make phone not enter sleep.