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

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https://hg.mozilla.org/integration/gaia-central/rev/7ba521485545
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #18352 from timdream/push

Bug 896145 - Split install-gaia into profile and push step, r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/aaa33b3aab0f
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 896145 - Split install-gaia into profile and push step
Bumping manifests a=b2g-bump