Bumping gaia.json for 1 gaia-1_2 revision(s) a=NPOTB

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https://hg.mozilla.org/integration/gaia-1_2/rev/b776aa5a0451
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12288 from dwi2/bug911139

Bug 911139 - [Keyboard][V1.2] The currently enabled keyboard should have a check mark, r=timdream