Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/118497e9bd32
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #11890 from ochameau/appterminated-manifestURL

Bug 911802 - Send manifestURL on appterminated event r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/840f698275c3
Author: Alexandre Poirot <poirot.alex@gmail.com>
Desc: Bug 911802 - Send manifestURL on appterminated event