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

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https://hg.mozilla.org/integration/gaia-central/rev/1bf6d2a2040c
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #16867 from mcav/fix-ring-inactive

Bug 979102 - [B2G][Clock] If a user lets an alarm go off for 10 minutes... r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/f125bf546d5b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 979102 - [B2G][Clock] If a user lets an alarm go off for 10 minutes without stopping it, the stop and snooze buttons will stop functioning
Bumping manifests a=b2g-bump