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

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https://hg.mozilla.org/integration/gaia-central/rev/0cc4be3cd3cd
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #25727 from laukstein/patch-1

Bug 958919 - Latvian keyboard, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/a39445a154b6
Author: Binyamin Laukstein <7raivis@inbox.lv>
Desc: Latvian keyboard #958919

https://bugzilla.mozilla.org/show_bug.cgi?id=958919
Bumping manifests a=b2g-bump