Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4ba63a032c72
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #23527 from gaye/calendar-modularization-2-force-gaia-try

Calendar modularization r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/0686cde936ea
Author: gaye <gaye@mozilla.com>
Desc: Bug 1023664 - Calendar modularization part 3

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https://hg.mozilla.org/integration/gaia-central/rev/a84c775f6c73
Author: gaye <gaye@mozilla.com>
Desc: Bug 1023664 - Calendar modularization part 2

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https://hg.mozilla.org/integration/gaia-central/rev/708780d27be4
Author: gaye <gaye@mozilla.com>
Desc: Bug 1023664 - Calendar modularization part 1

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https://hg.mozilla.org/integration/gaia-central/rev/ed9b6dc63210
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #22677 from rpappalax/bug-1049916-fxa-auto

Bug 1049916 - Create Firefox Accounts smoke tests to validate user authe...

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https://hg.mozilla.org/integration/gaia-central/rev/0835863debc0
Author: Richard Pappalardo <rpappalax@gmail.com>
Desc: Bug 1049916 - Create Firefox Accounts smoke tests to validate user authentication re=_6a68
Bumping manifests a=b2g-bump