Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/23bdefe73507
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12235 from lightsofapollo/revert-11915

Revert "Merge pull request #11915 from reubenmorais/contacts-customizati...

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https://hg.mozilla.org/integration/gaia-central/rev/ead989351aad
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Merge pull request #11915 from reubenmorais/contacts-customization"

This reverts commit 84e2d96144ce9e94cc1bd2f8da6a1d2f97c39181, reversing
changes made to 9cb0bf07dd6b8c23ee4c4db3d866464077f81e45.

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https://hg.mozilla.org/integration/gaia-central/rev/09c2b6e4e082
Author: Rudy Lu <left.lu@gmail.com>
Desc: Merge pull request #12223 from yxl/setInputMethodActive

Bug 842436 - Keyboard API: There should only be one keyboard active, and...
r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/9e6440eede90
Author: Yuan Xulei <xyuan@mozilla.com>
Desc: Bug 842436 - Keyboard API: There should only be one keyboard active, and Gecko should block interaction from non-active keyboards. r=rudyl

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7aa503060000efa988a0da0b8a3db86d3b672554", 
+    "revision": "23bdefe735072c51e04d1100750aa282d44eedc6", 
     "repo_path": "/integration/gaia-central"
 }