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

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https://hg.mozilla.org/integration/gaia-central/rev/7aee1094c654
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 961137 - Fix and reenable places marionette tests. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/7695b5016100
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 962554 - Lock places writes around mini transactions. r=kgrandon
Bumping manifests a=b2g-bump