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

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https://hg.mozilla.org/integration/gaia-central/rev/525fdbb2c322
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #23372 from gmarty/Bug-1057979-Status-Bar-Notifications-Indicator-appears-then-disappears-for-no-apparent-reason

Bug 1057979 - [Status Bar] Notifications Indicator appears then disappea...

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https://hg.mozilla.org/integration/gaia-central/rev/71915e743cc6
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1057979 - [Status Bar] Notifications Indicator appears then disappears for no apparent reason

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https://hg.mozilla.org/integration/gaia-central/rev/c0139e363302
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #23379 from yzen/bug-1037047

Bug 1037047 - fixed call options off screen transition screen reader vis...

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https://hg.mozilla.org/integration/gaia-central/rev/8f0d81547625
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1037047 - fixed call options off screen transition screen reader visibility. r=drs

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "93ee81b08d742cfd139578e21fbc56a0625efe95", 
+    "revision": "525fdbb2c322870ac807a99170ae749355ee0f95", 
     "repo_path": "/integration/gaia-central"
 }