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

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https://hg.mozilla.org/integration/gaia-2_0/rev/769c87ddca9a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22284 from KevinGrandon/bug_1045151_homescreen_localize_v20

Bug 1045151 - Cancel button on home screen not localized on 2.0

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https://hg.mozilla.org/integration/gaia-2_0/rev/897d2cc60bca
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1045151 - Cancel button on home screen not localized on 2.0 r=gandalf
Bumping manifests a=b2g-bump