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

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https://hg.mozilla.org/integration/gaia-central/rev/a8c76559e27e
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22678 from mikehenrty/bug-1050861-tornado

Bug 1050861 - Use version 2.4.1 for tornado in gaia unit tests

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https://hg.mozilla.org/integration/gaia-central/rev/cd6e46b1159e
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1050861 - Use version 2.4.1 for tornado in gaia unit tests

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "fb0904055ca5b8df25fe8cc0ff86ba6a6771ca25", 
+    "revision": "a8c76559e27e17cc1cb8ad1c78037f6999cca8aa", 
     "repo_path": "/integration/gaia-central"
 }