Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/4af5ec053993
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #14430 from steveck-chung/v1.2-uplift

Bug 929317 - [Message] Message waiting UI was flicked while start up. r=julienw, a=koi+

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https://hg.mozilla.org/integration/gaia-1_2/rev/9e9968757e13
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 929317 - [Message] Message waiting UI was flicked while start up