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

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https://hg.mozilla.org/integration/gaia-central/rev/56a1e3713de1
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #22527 from julienw/fix-desktop-mock

 Bug 1048902 - [Messages] fix small issue in the desktop mock r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/a921874c1403
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1048902 - [Messages] fix small issue in the desktop mock r=azasypkin

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "cf6d955a1703c6b7a947d0f01cb60955e7e87b0d", 
+    "revision": "56a1e3713de197b61cdd1e2373c582015d455ca3", 
     "repo_path": "/integration/gaia-central"
 }