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

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https://hg.mozilla.org/integration/gaia-central/rev/dc9a51bd4d98
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #26350 from timdream/input-mgmt-settings-default

Bug 1102141 - KeyboardHelper.getApps() should be sync if possible, r=mnjul

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https://hg.mozilla.org/integration/gaia-central/rev/7b454496b46d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1102141 - KeyboardHelper.getApps() should be sync if possible
Bumping manifests a=b2g-bump