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

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https://hg.mozilla.org/integration/gaia-central/rev/38e13b287b95
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #12042 from lodr/bug-914244-avoiding-see-undefined-in-contact-fields

Bug 914244 - Ensuring the givenName and familyName are not empty arrays before selecting the value.
r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/1cbcb5a2b140
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 914244 - Ensuring the givenName and familyName are not empty arrays before selecting the value.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "398a400524ec5770c775d38dade675c88dff49ee", 
+    "revision": "38e13b287b956f7e41c3ce591b5bc49dc29b6c80", 
     "repo_path": "/integration/gaia-central"
 }