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

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https://hg.mozilla.org/integration/gaia-central/rev/b4b5a84c10b2
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #32008 from justindarc/music-nga-search-pt2

Bug 1196333 (Part 2)

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https://hg.mozilla.org/integration/gaia-central/rev/a36e80849c05
Author: Jim <jporter@mozilla.com>
Desc: Bug 1196333 - [Music][NGA] Wire up front-end to search back-end

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https://hg.mozilla.org/integration/gaia-central/rev/56c902437550
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #31644 from jimporter/fl-ringtone

Bug 1200395 - [settings][ringtones][fl] Can't set ringtone to a purch…

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https://hg.mozilla.org/integration/gaia-central/rev/175d06a17b7a
Author: Jim <jporter@mozilla.com>
Desc: Bug 1200395 - [settings][ringtones][fl] Can't set ringtone to a purchased (forward-locked) ringtone file

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0fdfb547e58a6ee052896b9ac7e5c68435dc03dc", 
+        "git_revision": "5a226997b8bd317735ceec65c9e03b1e47a30b3c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "96dafb419871b67658495bed8aedd0ac660602ab", 
+    "revision": "b4b5a84c10b22619b0320e23d412f59b6d068b01", 
     "repo_path": "integration/gaia-central"
 }