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

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https://hg.mozilla.org/integration/gaia-central/rev/967189a54803
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #11871 from mcirlanaru/bug_911211

Bug 911211 - [Call Log] Remove DB upgrade code for version 5. r=@ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/7042f849aaf0
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 911211 - [Call Log] Remove DB upgrade code for version 5. r=ferjm

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "a7406abd6d2bc0c8ee635866b6ada695eb52a71c", 
+    "revision": "967189a54803d6c8ae0dfe12861d5e112e8f59a9", 
     "repo_path": "/integration/gaia-central"
 }