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

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https://hg.mozilla.org/integration/gaia-central/rev/2a4caf724ac0
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23686 from ehsan/1062564

Bug 1062564 - Inline the activity options used in the dialer app in order to make it easier to automatically extract the activity arguments from the source code

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https://hg.mozilla.org/integration/gaia-central/rev/97e0c05b34a0
Author: Ehsan Akhgari <ehsan@mozilla.com>
Desc: Bug 1062564 - Inline the activity options used in the dialer app in order to make it easier to automatically extract the activity arguments from the source code; r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/db02d90fdfed
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23651 from eliperelman/bug-1061962

Bug 1061962 - Offsetting system sleep dialog to account for SHB

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https://hg.mozilla.org/integration/gaia-central/rev/68e5d31e8c1b
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1061962 - Offsetting system sleep dialog to account for SHB

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0fb57036ab59f2a894123fde087e6f147c06f585", 
+    "revision": "2a4caf724ac0bbe7af8c5db6e6eb01e965c0804f", 
     "repo_path": "/integration/gaia-central"
 }