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

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https://hg.mozilla.org/integration/gaia-central/rev/789412b10065
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #30677 from yzen/bug-1172356

Bug 1172356 - [Settings] Convert accessibility switches to use gaia-switch, update their Gip test to work with shadowDOM

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https://hg.mozilla.org/integration/gaia-central/rev/4b0bdfc2d6a6
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1172356 - [Settings] Convert accessibility switches to use gaia-switch, update their Gip test tp work with shadowDOM

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "cd570fb72e7e6a2dcf004106e18d580c2e129b7c", 
+        "git_revision": "9fcbca92c63e239510cd5821cd18ad00d4e5e84f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "649ee686250e2e73c589be8f61b02ecb3d36e394", 
+    "revision": "789412b10065c6c556dcf329efc16d7546b0b384", 
     "repo_path": "integration/gaia-central"
 }