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

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https://hg.mozilla.org/integration/gaia-central/rev/e21d28d7a386
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #28105 from steveck-chung/message-avoid-viewcontact-inactivity

Bug 1124944 - [Messages] Disable view contact action while in activity, r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/7e06db892076
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1124944 - [Messages] Disable view contact action while in activity, r=julienw

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "2f33ab625b863410532c55341039ffc420796403", 
+        "git_revision": "8de3f9d45e4a295b0278f1fab0edfe059305e208", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ebd99ea4fdbbfb64a8750ac4adf8d497ef24ed2a", 
+    "revision": "e21d28d7a386cda445e9e4e562c7ae9328de4db9", 
     "repo_path": "integration/gaia-central"
 }