Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/9a6c98580372
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #18865 from eeejay/bug-995026

Bug 995026 - Rename keyboard app title to localizable "Keyboard", r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/02d4d8ecdff0
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 995026 - Rename keyboard app title to localizable "Keyboard".

========

https://hg.mozilla.org/integration/gaia-central/rev/6b8cb098f44b
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #18241 from mpizza/Bug_995093_test_keyboard_launch

Bug 995093 - Add a marionette test to check Keyboard app could show up correctly.

========

https://hg.mozilla.org/integration/gaia-central/rev/c7a95efbab38
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 995093 - Add a marionette test to check Keyboard app could show up correctly.
Bumping manifests a=b2g-bump