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

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https://hg.mozilla.org/integration/gaia-central/rev/4f9b96cfb0d5
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #10453 from davidflanagan/bug881239

Bug 881239: retain space or punctuation when reverting an auto-correction r=RudyLu

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https://hg.mozilla.org/integration/gaia-central/rev/5224690b9b64
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 881239: retain space or punctuation when reverting an auto-correction