Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/961def304c06
Author: Eric O'Connor <eric@bocoup.com>
Desc: Bug 944271 - [OTA][Data Migration][Clock] The alarm events will...
   be lost after update from v1.1 to v1.2

Adds a routine to startup.js to convert old Alarm entries to the
new format.