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

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https://hg.mozilla.org/integration/gaia-2_1/rev/d0dc4b30a85d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1088632 - [Integration] Disable test - Homescreen tests are failing in v2.1 r=kgrandon a=npotb
Bumping manifests a=b2g-bump