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

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https://hg.mozilla.org/integration/gaia-central/rev/c8c59bbc67fc
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #14833 from steveck-chung/bug-948356

Bug 948356 - [SMS] Keyboard is still opened when message options menu displayed . r=borjasalguero, a=blocking-b2g 1.3+

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https://hg.mozilla.org/integration/gaia-central/rev/16f9d6cbca21
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 948356 - [SMS] When displaying message options (tap and hold on a message) and the keyboard is open