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

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https://hg.mozilla.org/integration/gaia-central/rev/57ca61c5a07e
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #25583 from viorelaioia/bug-1087383

Bug 1087383 - Add a test that sets the wallpaper from Gallery, by long p...

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https://hg.mozilla.org/integration/gaia-central/rev/84eebc0ac8ed
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1087383 - Add a test that sets the wallpaper from Gallery, by long press on the screen

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a582621c22327b67c263208686a50524d72bf129", 
+    "revision": "57ca61c5a07ecafadf699a9f531207921662ea70", 
     "repo_path": "integration/gaia-central"
 }