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

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https://hg.mozilla.org/integration/gaia-central/rev/f239513dae93
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #12381 from mpizza/Bug_911129_lost_focus

Bug 911129 - [Keyboard][V1.2] After switching the keyboard layout, the c... . r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/b9bf5c1ab5ae
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Bug 911129 - [Keyboard][V1.2] After switching the keyboard layout, the cursor doesn't focus on text field
   -- action menu would not take focus when keyboard was been shown
   -- remove comment in keyboard manager since action menu is scrollable when there is a large list of items.