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

========

https://hg.mozilla.org/integration/gaia-central/rev/1a6d1000f29f
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #23230 from jrburke/bug1005446-email-custom-elements

Bug 1005446 - [email] try custom elements for cards r=asuth

========

https://hg.mozilla.org/integration/gaia-central/rev/a402cf384c06
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1005446 - [email] custom elements for cards
avoid body work if the header no longer matches, or if card has been destroyed

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2241041206a000a645999233c2c6061ba9f5793c", 
+    "revision": "1a6d1000f29f30e55dedd07a43cce643694e5c52", 
     "repo_path": "/integration/gaia-central"
 }