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

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https://hg.mozilla.org/integration/gaia-central/rev/186e3a258ac3
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #22785 from viorelaioia/bug_1052414

Bug 1052414 - Move the import of PlivoUtil to the test methods to avoid ...

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https://hg.mozilla.org/integration/gaia-central/rev/97d1b691a9ae
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1052414 - Move the import of PlivoUtil to the test methods to avoid import errors when plivo is not present

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9f88434e3a0e3183fb8600b6e5a39928fc5d03f1", 
+    "revision": "186e3a258ac33de13629e4ad8fb9d9370185fe20", 
     "repo_path": "/integration/gaia-central"
 }