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

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https://hg.mozilla.org/integration/gaia-central/rev/1ff621b5d97f
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13410 from timdream/keyboard-rename-followup

Bug 935350 - Rename 'keyboard' role in homescreen, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/1f26eb964f43
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 935350 - Rename 'keyboard' role in homescreen, +shepherd