Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/217be9d41f1a
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #28040 from evelynhung/issue-1123565

Bug 1123565 - Initial work of dashboard app. r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/50de0810409f
Author: Evelyn Hung <jj.evelyn@gmail.com>
Desc: Bug 1123565 - Initial work of dashboard app.

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https://hg.mozilla.org/integration/gaia-central/rev/dcd09c835b15
Author: Marina <marina.rodrigueziglesias@telefonica.com>
Desc: Merge pull request #27820 from gitmai/bug-1127807-adding-sendNotification-method

Bug 1127807 - [Usage] MessageHandler.js add method to send notifications
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/3e4e15a0e570
Author: mai <mri@tid.es>
Desc: Bug 1127807 - [Usage] MessageHandler.js add method to send notifications

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a85b768ababe56fbb6c22bf09bf72b64e5eb0a59", 
+        "git_revision": "ac318c15573dc94e1a857ef1fd8e4592a0845d93", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9efc7642783d7d3998f8f20ed02a60785473c260", 
+    "revision": "217be9d41f1a480c402ad42b6ca4bd832e054177", 
     "repo_path": "integration/gaia-central"
 }