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

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https://hg.mozilla.org/integration/gaia-central/rev/406f8198e2b1
Author: Reza Akhavan <reza@akhavan.me>
Desc: Merge pull request #33261 from jedireza/home-button-closes-update-manager-dialogs

Bug 1225330 - Status bar icons change color before homescreen transition when home button is pressed

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https://hg.mozilla.org/integration/gaia-central/rev/005d4d88cd10
Author: jedireza <reza@akhavan.me>
Desc: Bug 1225330 - Status bar icons change color before homescreen transition when home button is pressed

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "83ab258bea992aa391c86e1ad2c94458b4b30a92", 
+        "git_revision": "64aba1a65219ca906ccba27a6b762612dcec1fc6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "491ca5a2c7b55bee6486517df0cfcc95afae6506", 
+    "revision": "406f8198e2b16fc1b28107725f35fd8d135b3b81", 
     "repo_path": "integration/gaia-central"
 }