Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/81fac00e111e
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Merge pull request #32165 from JohanLorenzo/bug-1210047

Bug 1210047 - test_system_notification_bar.py : TimeoutException: Tim…

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https://hg.mozilla.org/integration/gaia-central/rev/42bc056ea1f5
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1210047 - test_system_notification_bar.py : TimeoutException: TimeoutException: Timed out after 10.1 seconds

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https://hg.mozilla.org/integration/gaia-central/rev/223492be5ae7
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Merge pull request #32136 from JohanLorenzo/bug-1209562

Bug 1209562 - test_fmradio_frequency_dialer.py : UnicodeEncodeError: …

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https://hg.mozilla.org/integration/gaia-central/rev/f4e00e25c130
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1209562 - test_fmradio_frequency_dialer.py : UnicodeEncodeError: 'decimal' codec can't encode character u'\u2068' in position 0: invalid decimal Unicode string

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "6caf6e5bdebc078556c87d254d144d38630f1fdf", 
+        "git_revision": "20ce30b5949c1cb3094b6c03e59d5c1fb9b69ed6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ea4a112483b22427ee3196b6b32de89d218b55c9", 
+    "revision": "81fac00e111ee4971214a21927b61eb6a76639b3", 
     "repo_path": "integration/gaia-central"
 }