Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/cf4b9e1d77d1
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 902390 - [sms][mms] the input is 1px too high with the 'Moz' font r=borja