Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/66a83bdf05e2
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1138268 - merge pull request #28545 from KevinGrandon:bug_1138268_icon_sizing to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/756e87985efa
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1138268 - Set background size for suggestion icon

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https://hg.mozilla.org/integration/gaia-central/rev/2552ecf10805
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1126080 - merge pull request #28564 from npark-mozilla:1126080 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/4fbd40725d5c
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1126080 - Intermittent test_music_change_rating.py TestSetMusicRating.test_music_change_rating | TimeoutException: TimeoutException: Timed out after 10.1 seconds

The overlay could be disappearing at odd time intervals, so tap the screen right before checking for the star

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "2c6b1468fc5853ab5c1f54d72c209326b5886559", 
+        "git_revision": "8dcb45cdc14bad2abe23eefce51b5a77655c5ec5", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "3ef4486a1467e3899da9e1e29b4d9e57e64b2d0c", 
+    "revision": "66a83bdf05e2a982392eaff1d171705ff067b13f", 
     "repo_path": "integration/gaia-central"
 }