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

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https://hg.mozilla.org/integration/gaia-central/rev/1cd63caaf46e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #24447 from julienw/1073159-fix-update-manager-tests

Bug 1073159 - [System] fix update_manager.js tests with a newer mocha r=...

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https://hg.mozilla.org/integration/gaia-central/rev/b02174600c9c
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1073159 - [System] fix update_manager.js tests with a newer mocha r=etienne
Bumping manifests a=b2g-bump