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

========

https://hg.mozilla.org/integration/gaia-central/rev/28ec60b9e1eb
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #24201 from gasolin/issue-1064898

Bug 1064898 - Time picker is not displaying AM/PM for 12 hours format af..., r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/aacb637b1d30
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1064898 - Time picker is not displaying AM/PM for 12 hours format after change locale

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "b8eec55b492985012cd623fa22b55bd6a8383d29", 
+    "revision": "28ec60b9e1ebe0af79d2bed3e978ec90dbf1b847", 
     "repo_path": "/integration/gaia-central"
 }