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

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https://hg.mozilla.org/integration/gaia-central/rev/9064ceecf40d
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13545 from pivanov/bug-935960

Bug 935960 - [System] Data connection and Data roaming confirm screens styling incorrect, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/4835325e89b8
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 935960 - [System] Data connection and Data roaming confirm screens styling incorrect