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

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https://hg.mozilla.org/integration/gaia-central/rev/a136cf762113
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #20223 from timdream/lockscreen-init

Bug 995158 - Assign lockScreen to window.lockScreen before sending events, r=mnjul

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https://hg.mozilla.org/integration/gaia-central/rev/26fed2f39b50
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 995158 - Assign lockScreen to window.lockScreen before sending events
Bumping manifests a=b2g-bump