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

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https://hg.mozilla.org/integration/gaia-central/rev/2c31857e3104
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #19044 from EragonJ/bug-1007466

Bug 1007466 - [Setting] DSDS related panels can't work when testing on N...

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https://hg.mozilla.org/integration/gaia-central/rev/49560b195964
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1007466 - [Setting] DSDS related panels can't work when testing on Nightly

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "773bc13adf6eecf5437e53cac894bef9fb39bc88", 
+    "revision": "2c31857e31048d05f9bb335d8ef2408c612195af", 
     "repo_path": "/integration/gaia-central"
 }