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

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https://hg.mozilla.org/integration/gaia-central/rev/24953fb362ca
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #19828 from flodolo/bug938306

Bug 938306 - [l10n] Install app, avoid overlap between "Size" label and value. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/c1d7e1092bc1
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 938306 - Install app, avoid overlapping between "Size" label and value
Bumping manifests a=b2g-bump