Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/8140a852e7a7
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #13274 from mpizza/Bug_932257_v1.2

Merge pull request #13179 from mpizza/Bug_932257_keyboard_not_hidden. r=rudyl.

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https://hg.mozilla.org/integration/gaia-1_2/rev/ac3608b0dab3
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #13179 from mpizza/Bug_932257_keyboard_not_hidden

Bug 932257 - [keyboard] previous InputMethod will not disappear while sw.... r=rudyl.
(cherry picked from commit d59c9446595eba2677fdcb363b2b42ae52ee0b12)