Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/37e5a35822f7
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13248 from timdream/italian

Bug 893358 - Add Italian keyboard layout support r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/24dbb1399e76
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 893358 - Add Italian keyboard layout support

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https://hg.mozilla.org/integration/gaia-central/rev/87f2682204f0
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 921721 - hotfix to bust JS Exception in startup a=testonly r=me