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

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https://hg.mozilla.org/integration/gaia-central/rev/2e1e72454fc4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25275 from KevinGrandon/reland_bug_1082911

Bug 1082911 - Adding integration tests for SHB homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/a3a8d3a9fef8
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1082911 - Adding integration tests for SHB homescreen
Bumping manifests a=b2g-bump