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

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https://hg.mozilla.org/integration/gaia-central/rev/f81a113f2dec
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15761 from etiennesegonzac/bug-963582-persona-popup-fix

Bug 963582 - Backing out part of bug 962547 to fix the trustedUI display tied to a transitionend. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/9123533145e0
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 963582 - Backing out part of bug 962547 to fix the trustedUI display tied to a transitionend.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b91bf20deb931e11dffb47d6f8536f5a40603e3a", 
+    "revision": "f81a113f2decb2d01d168f8c4a7e1338d1319d85", 
     "repo_path": "/integration/gaia-central"
 }