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

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https://hg.mozilla.org/integration/gaia-central/rev/620244dcbd27
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #25062 from timdream/keyboard-target-map-debug

Bug 1081676 -  Debug output for LayoutRenderingManager.p.getTargetObject(), r=mnjul

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https://hg.mozilla.org/integration/gaia-central/rev/0e925c9ecf40
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1081676 -  Debug output for LayoutRenderingManager.p.getTargetObject()
Bumping manifests a=b2g-bump