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

========

https://hg.mozilla.org/integration/gaia-central/rev/903341e6f06d
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #31574 from bevis-tseng/Bug_1198676

Bug 1200125 - Explicitly cancel USSD session when USSD Dialog is closed. r=gsvelto

========

https://hg.mozilla.org/integration/gaia-central/rev/9950785327ea
Author: Bevis Tseng <btseng@mozilla.com>
Desc: Bug 1200125 - Explicitly cancel USSD session when USSD Dialog is
closed. r=gsvelto

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "6905956c041a42107aaa8b503baaf83c9a599591", 
+        "git_revision": "256b37ee9c84b0d6aa69c0c6c2e9187aeb919f0a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ebe44dcbbaa8fdbc3943b359a670a0b9d01a8896", 
+    "revision": "903341e6f06de421f23185f0246dfdb4bd973942", 
     "repo_path": "integration/gaia-central"
 }