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

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https://hg.mozilla.org/integration/gaia-central/rev/39ba256131e3
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26587 from yzen/bug-1106541

Bug 1106541 - scoping a present day selector to active month.

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https://hg.mozilla.org/integration/gaia-central/rev/7a13d55acdeb
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1106541 - scoping a present day selector to active month.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "557f265c7dcb6bac4eb82d71dda9003f132fa6aa", 
+    "revision": "39ba256131e3d92e91f2d24c27c4056854afcc81", 
     "repo_path": "integration/gaia-central"
 }