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

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https://hg.mozilla.org/integration/gaia-central/rev/bb0703b0aa9d
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #27339 from dwi2/bug1115633

Bug 1115633 - [Stingray] Unpin app in App-Deck using IAC and uninstall app, r=rexboy7

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https://hg.mozilla.org/integration/gaia-central/rev/3b9af58fd266
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1115633 - [Stingray] Unpin app in App-Deck using IAC and uninstall app

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https://hg.mozilla.org/integration/gaia-central/rev/965fbcc926a0
Author: Sean Lee <weilonge@gmail.com>
Desc: Merge pull request #27368 from weilonge/seanlee/STK/master/Bug1119633

Bug 1119633 - Add Send SS, Send USSD and Send SMS default message. r=frsela

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https://hg.mozilla.org/integration/gaia-central/rev/4f267edb3848
Author: Sean Lee <selee@mozilla.com>
Desc: Bug 1119633 - Add Send SS, Send USSD and Send SMS default message.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "72fe8d03b0aecdc61d738e03bf5638b936a59632", 
+    "revision": "bb0703b0aa9d8d6d554d5c79dc91af0089480b44", 
     "repo_path": "integration/gaia-central"
 }