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

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https://hg.mozilla.org/integration/gaia-central/rev/571fba20230e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22098 from KevinGrandon/bug_1043261_homescreen_item_addition

Bug 1043261 - [Vertical Homescreen] Unable to delete invalid grid object

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https://hg.mozilla.org/integration/gaia-central/rev/3ba43abecb54
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1043261 - [Vertical Homescreen] Unable to delete invalid grid object r=crdlc
Bumping manifests a=b2g-bump