Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/a05fce287d1c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Disable intermittent reply_imap_email_test.js test

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "34115df6b705230c53988ff7d0bdc321541b96ab", 
+    "revision": "a05fce287d1cb11fe143db7656a854ea5d29bead", 
     "repo_path": "/integration/gaia-central"
 }