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

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https://hg.mozilla.org/integration/gaia-central/rev/e6d3ee802cd7
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31747 from mermi/bug1188926

Bug 1188926 - Make all the apps have an manifestURL as well as a name and check for that

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https://hg.mozilla.org/integration/gaia-central/rev/23d5b1cc5b88
Author: mermi <manel.rhaiem92@gmail.com>
Desc: make manifestURL instead of name

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "e938ac2795efeeb2ecec8c47b33c9f7f8183e4eb", 
+        "git_revision": "966fa584e67354cf835151320670f682dee1ba7f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c0f536773eca24b5eaf30ceffe3bb8d41c51827f", 
+    "revision": "e6d3ee802cd7701368d067fac033b0a2bfa34bc9", 
     "repo_path": "integration/gaia-central"
 }