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

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https://hg.mozilla.org/integration/gaia-central/rev/466dd8abf709
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19539 from KevinGrandon/bug_1010336_vertical_dividers

Bug 1010336 - [Home2] Update divider visual design

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https://hg.mozilla.org/integration/gaia-central/rev/819311f1e525
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1010336 - [Home2] Update divider visual design r=crdlc
Bumping manifests a=b2g-bump