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

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https://hg.mozilla.org/integration/gaia-central/rev/4ee7860cab2b
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #32755 from hkasemir/1203967-optgroup-color

Bug 1203967 - change color of optgroup header. r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/83b16b3229be
Author: Heidi Kasemir <heidi.kasemir@gmail.com>
Desc: Bug 1203967 - change color of optgroup header

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "68febcc83f4efc2122c784aa01fbfdbc4b3f8151", 
+        "git_revision": "01b38b061958ab8593794f901a380b40de77cf70", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "dbb8dfb4dd9be2b15c161a8ff814ba0e379d0411", 
+    "revision": "4ee7860cab2bc03f9ef33ab702dccaa045eb4f63", 
     "repo_path": "integration/gaia-central"
 }