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

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https://hg.mozilla.org/integration/gaia-central/rev/58749b76a31e
Author: Sam Foster <sfoster@mozilla.com>
Desc: Merge pull request #32642 from sfoster/ftu-skip-step-bug-1216809

Bug 1216809 - skipStep should increment/decrement by 1. r=jedireza

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https://hg.mozilla.org/integration/gaia-central/rev/431a9e843534
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1216809 - skipStep should increments/decrement by 1.

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https://hg.mozilla.org/integration/gaia-central/rev/1aaad3435979
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #32234 from hfiguiere/bug1208083-context-search

Bug 1208083 - Part 3: Context search r=justindarc

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https://hg.mozilla.org/integration/gaia-central/rev/9bd9b9ff5380
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1208083 - Part 3: Context search

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "063bc774d6396f834932c68174bf579cff925214", 
+        "git_revision": "c8bf4bb09dcbfcbc5bacaae7ddf15bf094779770", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "81194c60006e3b66de14d5588dc8985b7fc774ec", 
+    "revision": "58749b76a31efd05ab201b8ab5256fe8cf3ba9f4", 
     "repo_path": "integration/gaia-central"
 }