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

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https://hg.mozilla.org/integration/gaia-central/rev/5ca5ac2fe9b2
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #22870 from snowmantw/issue1035754

Bug 1035754 - [Gaia][lock screen] support 24 hour time format

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https://hg.mozilla.org/integration/gaia-central/rev/9b0e6e3bdd6f
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1035754 - [Gaia][lock screen] support 24 hour time format

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "af5d777fc37a48f7c8cc85389841a96a81df80b9", 
+    "revision": "5ca5ac2fe9b239c2bf27f4c25b03805c13257e9d", 
     "repo_path": "/integration/gaia-central"
 }