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

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https://hg.mozilla.org/integration/gaia-central/rev/686c0d939069
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #31144 from gasolin/issue-1088450

Bug 1088450 - improve Bluetooth transfer messages, r=tim

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https://hg.mozilla.org/integration/gaia-central/rev/23423888d312
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1088450 - improve Bluetooth transfer messages, r=tim

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b57e9a0b5aee45f80d1ee8bfe69625ab4db20b5c", 
+        "git_revision": "706c70297029531dcf862fd8dcdcc5ddf80961b3", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "655229371e43fe4ec41dfc49a9af1dd217f21448", 
+    "revision": "686c0d939069b261549ecdc75d7b577be0029587", 
     "repo_path": "integration/gaia-central"
 }