Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b31caa58da01
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #28410 from stasm/1099321-remove-ar-fr-zh-TW

Bug 1099321 - Remove ar, fr and zh-TW files in Gaia. r=gandalf r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/2a2352114808
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1099321 - Remove ar, fr and zh-TW files in Gaia. r=gandalf r=kgrandon

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1494fcd7ed1fd9913cac85137b59bd185282ba3b", 
+        "git_revision": "1cb43e424af904ce45bcf2bd312dd2c1ca03af2c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8a5d55a49c325f322261479e53a2b09445915316", 
+    "revision": "b31caa58da013efc9db4e7fc7a1ce867dda8b76a", 
     "repo_path": "integration/gaia-central"
 }