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

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https://hg.mozilla.org/integration/gaia-central/rev/91522030959b
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #28866 from albertopq/1129701-icon-search

Bug 1129701 - RTL improvements on the search results r=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/2aeefbd3e18e
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1129701 - RTL improvements on the search results

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https://hg.mozilla.org/integration/gaia-central/rev/f91e4c1419d9
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #28970 from steveck-chung/message-thread-list-RTL

Bug 1138350 - [Messages][RTL] Ellipsis direction fix in thread list view, r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/d56ae714f730
Author: steveck-chung <schung@mozilla.com>
Desc: Bug 1138350 - [Messages][RTL] Ellipsis direction fix in thread list view, r=julienw

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "6d27d00da5c30ac52bc94b2e14eed5e4bb4ead37", 
+        "git_revision": "8c9cb3713ce4e222ff90d96bd05e0659c8ce5016", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "48ec78b24f56a106bb240846dea60c0ca77f20fe", 
+    "revision": "91522030959b5a579ef8e456ad17b4c299d5db5b", 
     "repo_path": "integration/gaia-central"
 }