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

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https://hg.mozilla.org/integration/gaia-central/rev/c34c4dc5719c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22892 from KevinGrandon/bug_1053894_remove_confirm_component_bg

Bug 1053894 - Remove gradient images from GaiaConfirm component

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https://hg.mozilla.org/integration/gaia-central/rev/8070f551eb26
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1053894 - Remove gradient images from GaiaConfirm component r=ivanovpavel
Bumping manifests a=b2g-bump