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

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https://hg.mozilla.org/integration/gaia-central/rev/2ae32cb6f2f8
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #16165 from steveck-chung/message-sentTimestamp

Bug 961574 - [Gaia][Messages] Display sent timestamp in received message report. r=borjasalguero

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https://hg.mozilla.org/integration/gaia-central/rev/6a1411427e0d
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 961574 - [Gaia][Messages] Display sent timestamp in received message report
Bumping manifests a=b2g-bump