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

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https://hg.mozilla.org/integration/gaia-central/rev/4009a398dec7
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #17137 from DouglasSherk/dsds-mozicc

Bug 982723 - [DSDS][Dialer] Use mozIccManager instead of mozMobileConnections in SimPicker and CallButton. r=Rik

========

https://hg.mozilla.org/integration/gaia-central/rev/3bf4b74fbcaf
Author: DouglasSherk <github@sherk.me>
Desc: Bug 982723 - [DSDS][Dialer] Use mozIccManager instead of mozMobileConnections in SimPicker and CallButton. r=Rik

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "b4e4e893a644748898a3a23d25e619789dbe02cd", 
+    "revision": "4009a398dec708b00d39a4aeb880b644be50e006", 
     "repo_path": "/integration/gaia-central"
 }