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

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https://hg.mozilla.org/integration/gaia-central/rev/67182d86b58d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12661 from jmcanterafonseca/fix_sim_call2

Bug 918582 - [B2G] [Buri] [Contacts] User sees no response when tapping ...

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https://hg.mozilla.org/integration/gaia-central/rev/c728dc8bfd9f
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 918582 - [B2G] [Buri] [Contacts] User sees no response when tapping contact phone number with no SIM in the device

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6848f14fe19d5fff23cf329d6f461144a1595052", 
+    "revision": "67182d86b58d3bb9cb6a8124feaa1230e2229321", 
     "repo_path": "/integration/gaia-central"
 }