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

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https://hg.mozilla.org/integration/gaia-central/rev/2187e6fbf807
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #26591 from chirarobert/bug_1097754

Bug 1097754 - Investigate intermittent failure of test_dialer_receive_ca...

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https://hg.mozilla.org/integration/gaia-central/rev/edbef0a8b916
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1097754 - Investigate intermittent failure of test_dialer_receive_call_with_locked_screen.py

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4122e54a676b32a5172a079572a37eb950b7e486", 
+    "revision": "2187e6fbf807f6a9f3e19c1dc60110a3e3b470bb", 
     "repo_path": "integration/gaia-central"
 }