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

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https://hg.mozilla.org/integration/gaia-central/rev/a3937490c2c0
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #22871 from gasolin/issue-1053131

Bug 1053131 - [settings]SIM security is hard to find, r=eragon

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https://hg.mozilla.org/integration/gaia-central/rev/6c8016aa1cea
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1053131 - [settings]SIM security is hard to find

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https://hg.mozilla.org/integration/gaia-central/rev/664a3a0924d1
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #22825 from EragonJ/bug-1050699

Bug 1050699 - [B2G] "Unknow SIM card state" is shown on "Call Settings" ...

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https://hg.mozilla.org/integration/gaia-central/rev/2820bebc7c53
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1050699 - [B2G] "Unknow SIM card state" is shown on "Call Settings" and ...

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "dbcde4fcff9ec20301f9d5db163a5ee6a0436178", 
+    "revision": "a3937490c2c043644a7a14def2c4068ea6267245", 
     "repo_path": "/integration/gaia-central"
 }