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

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https://hg.mozilla.org/integration/gaia-central/rev/d1276095f679
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #17587 from mcav/clock-timeout-master

Bug 986753 - [Tarako] Alarm Clock can get killed in the background. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/050120528940
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 986753 - [Tarako] Alarm Clock can get killed in the background and never ring.
Bumping manifests a=b2g-bump