Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ef20236bd60e
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21097 from crdlc/bug-1027253

Bug 1027253 - [Rocketbar][Settings] Missing grey subheaders in the setti...

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https://hg.mozilla.org/integration/gaia-central/rev/be3f91f67d02
Author: crdlc <crdlc@tid.es>
Desc: Bug 1027253 - [Rocketbar][Settings] Missing grey subheaders in the settings for homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/64b9a8807983
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21096 from crdlc/bug-1025517

Bug 1025517 - [Homescreen] Search bar text box not centered vertically i...

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https://hg.mozilla.org/integration/gaia-central/rev/0c18086f6a85
Author: crdlc <crdlc@tid.es>
Desc: Bug 1025517 - [Homescreen] Search bar text box not centered vertically in container

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https://hg.mozilla.org/integration/gaia-central/rev/7328ad5e844a
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #20880 from chuck-lee/bug-1010252_reconnect_issue

Bug 1010252 - Only forget connectingfail network triggered by user. r=ejchen a=1.3+

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https://hg.mozilla.org/integration/gaia-central/rev/6d29c0f4991d
Author: Chuck Lee <chulee@mozilla.com>
Desc: Bug 1010252 - Only forget connectingfail network triggered by user. r=ejchen a=1.3+

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "6fff664db309cd5b60b4de398a1293b9d28dacfc", 
+    "revision": "ef20236bd60e81103e4d469bd29fd90834dee380", 
     "repo_path": "/integration/gaia-central"
 }