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

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https://hg.mozilla.org/integration/gaia-central/rev/0fdd6940d8a4
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12699 from timdream/timezone-bug813987

Bug 916068 - make sure tzselector still works w/o voice network, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/b2006527d61d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 916068 - make sure tzselector still works w/o voice network