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

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https://hg.mozilla.org/integration/gaia-central/rev/f4b0b276eb8f
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #22461 from timdream/keyboard-vwrapper-css

Bug 1048025 - Set pointer-events: none to visual-wrapper, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/0d72a2159857
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1048025 - Set pointer-events: none to visual-wrapper
Bumping manifests a=b2g-bump