Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/833fe08c489d
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #11056 from ochameau/gaia-mixed-revs

Bug 887761 - Prevent multilocale build rules from messing up with gaia revisions. r=l10n

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https://hg.mozilla.org/integration/gaia-central/rev/a02226a40535
Author: Alexandre Poirot <poirot.alex@gmail.com>
Desc: Bug 887761 - Prevent multilocale build rules from messing up with gaia revisions.