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

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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

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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".

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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.

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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.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1b0c17f9088596cff6bcae64418ce45f91d64dec", 
+    "revision": "9a6c985803729654d45a33909fbeac761855292b", 
     "repo_path": "/integration/gaia-central"
 }