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

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https://hg.mozilla.org/integration/gaia-central/rev/87bfcb576b65
Author: Rudy Lu <left.lu@gmail.com>
Desc: Merge pull request #10669 from RudyLu/keyboard/swipe_hide_keyboard_2

Bug 805586 - support "Swipe down" to hide the keyboard

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https://hg.mozilla.org/integration/gaia-central/rev/415cba41ef6c
Author: Rudy Lu <left.lu@gmail.com>
Desc: Bug 805586 - support "Swipe down" to hide the keyboard
  1. Add the dialog for FTU tip of swipe down
  2. Refine the swipe down behavior not to show the highlighted key