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

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https://hg.mozilla.org/integration/gaia-central/rev/bdc2d477fa1d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #25753 from timdream/keyboard-aria-label2

Bug 1092911 - Correct aria-label for layout switching keys, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/e9d899d92a37
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1092911 - Correct aria-label for layout switching keys
Bumping manifests a=b2g-bump