Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/152f90d88038
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1034729 - [Vertical] Mis-named test, app_hosted_use_cached_icon.js, does not run r=me
Bumping manifests a=b2g-bump