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

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https://hg.mozilla.org/integration/gaia-central/rev/cadab6aa942c
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #17828 from mcav/reland-integration-tests

Bug 971135 - [Clock] Port all Clock integration tests from Python to Jav...

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https://hg.mozilla.org/integration/gaia-central/rev/d4ed08f6b8f2
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 971135 - [Clock] Port all Clock integration tests from Python to JavaScript. r=millermedeiros
Bumping manifests a=b2g-bump