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

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https://hg.mozilla.org/integration/gaia-central/rev/32908f407ce4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19621 from KevinGrandon/bug_1015769_vertical_menu_component

Bug 1015769 - Use gaia-menu component in vertical homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/fc584e675471
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1015769 - Use gaia-menu component in vertical homescreen r=crdlc
Bumping manifests a=b2g-bump