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

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https://hg.mozilla.org/integration/gaia-central/rev/3cec67806b29
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22729 from mozmark/bug1027749

Bug 1027749 - Play sound doesn't seem to stop playing after you unlock t...

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https://hg.mozilla.org/integration/gaia-central/rev/8b24cb54562e
Author: Mark Goodwin <mgoodwin@mozilla.com>
Desc: Bug 1027749 - Play sound doesn't seem to stop playing after you unlock the device r=ggp
Bumping manifests a=b2g-bump