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

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https://hg.mozilla.org/integration/gaia-central/rev/a2426dbc91d3
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13740 from crh0716/937389

Bug 937389 - Refresh caller ID settings when settings app becomes visible r=crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/ea69963df443
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 937389 - Refresh caller ID settings when settings app becomes visible