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

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https://hg.mozilla.org/integration/gaia-central/rev/6de4482df209
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24028 from KevinGrandon/bug_1062048_calendar_intermittent_12_24_hrs

Bug 1062048 - Intermittent failing test, TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/calendar/test/marionette/day_view_test.js | day view before each hook AssertionError: expected '12:xx' to equal '0:xx'

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https://hg.mozilla.org/integration/gaia-central/rev/ac7938ed68d6
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1062048 - Intermittent failing test, TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/calendar/test/marionette/day_view_test.js | day view before each hook AssertionError: expected '12:xx' to equal '0:xx' r=kgrandon
Bumping manifests a=b2g-bump