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

========

https://hg.mozilla.org/integration/gaia-central/rev/387455fe64df
Author: Carmen Jiménez <carmen.jimenezcabezas@telefonica.com>
Desc: Merge pull request #23640 from mcjimenez/bug1061750

Bug 1061750 - SV Build: Generate the configuration file for bookmarks (r = yurenju)

========

https://hg.mozilla.org/integration/gaia-central/rev/7db310555def
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1061750 - SV Build: Generate the configuration file for bookmarks

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "80c9984a1430fa2628e4e99925ea339d030370e3", 
+    "revision": "387455fe64dfe95aae28b740d4e5189d439b2cfe", 
     "repo_path": "/integration/gaia-central"
 }