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

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https://hg.mozilla.org/integration/gaia-central/rev/a6b6fd3772ee
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25144 from KevinGrandon/bug_1082683_fte_test_structure

Bug 1082683 - [FTE] Integration test structure

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https://hg.mozilla.org/integration/gaia-central/rev/8d1dc1481c8f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1082683 - [FTE] Integration test structure r=sfoster

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1fce6e55eca37ff86ffe924fd7ca56da7930e4fe", 
+    "revision": "a6b6fd3772ee67f8e1cf1978baf74d430ab18286", 
     "repo_path": "/integration/gaia-central"
 }