Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ed5c8ddee5c9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 996662 - Disable intermittent failing search tests on TBPL

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https://hg.mozilla.org/integration/gaia-central/rev/82b3fa8cd6e2
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18344 from mcav/default-sound

Bug 986105 - [clock] [timer] default setting set to "no sound". r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/bbf82b19562b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 986105 - [clock] [timer] default setting set to "no sound".
Bumping manifests a=b2g-bump