Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/4fb548eac9e1
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13262 from davidflanagan/bug893358-v1.2

Merge pull request #13248 from timdream/italian

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https://hg.mozilla.org/integration/gaia-1_2/rev/12b0d4930ce2
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13248 from timdream/italian

Bug 893358 - Add Italian keyboard layout support r=djf(cherry picked from commit 4d468a5d00a02914fb440d50110a4e5e052adc8e)