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

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https://hg.mozilla.org/integration/gaia-central/rev/a4a76a4221d7
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #23800 from jrburke/bug1059100-email-oauth

Bug 1059100 - [email] Implement XOAUTH2 authentication support for gmail. r=asuth, r=jrburke, r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/5b0da91f3edc
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1059100 - [email] Implement XOAUTH2 authentication support for gmail. r=asuth, r=jrburke, r=mcav

landing gelam https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/336 too

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https://hg.mozilla.org/integration/gaia-central/rev/4240927dc75d
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #23857 from gmarty/Bug-1061127-time-notification-lockscreen-keeps-display-just-now-as-time-elapsed

Bug 1061127 - [Lockscreen] The time of notification in lockscreen keeps ...

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https://hg.mozilla.org/integration/gaia-central/rev/2d4cacecc8a4
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1061127 - [Lockscreen] The time of notification in lockscreen keeps display just now as time elapsed

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5c083c0441b0158afc0152d0b741887743fa831f", 
+    "revision": "a4a76a4221d7d963d01377f38d68768d0e829017", 
     "repo_path": "/integration/gaia-central"
 }