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

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https://hg.mozilla.org/integration/gaia-central/rev/db96ee72512f
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #23805 from arcturus/bug-1064256

Bug 1064256 - [Contacts] "TypeError: iceGroup is null" r=sergi

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https://hg.mozilla.org/integration/gaia-central/rev/b29a8337189c
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1064256 - [Contacts] "TypeError: iceGroup is null"
Bumping manifests a=b2g-bump