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

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https://hg.mozilla.org/integration/gaia-central/rev/9c39fc940d76
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #13131 from snowmantw/issue930362

Bug 930362 - [LockScreen] The icons background would light up when touch on them

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https://hg.mozilla.org/integration/gaia-central/rev/29cde2ae7c91
Author: Greg Weng (snowmantw) <gweng@mozilla.com>
Desc: Bug 930362 - [LockScreen] The icons background would light up when touch on them