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

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https://hg.mozilla.org/integration/gaia-central/rev/889f661704b9
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #22369 from pivanov/bug-1035687-followup

Bug 1035687 - [SMS] - check missing images | followup

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https://hg.mozilla.org/integration/gaia-central/rev/c4fb2fda894a
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035687 - [SMS] - check missing images | followup

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ec10783e69dadf6f99f8371f46bf03903914ed88", 
+    "revision": "889f661704b97eb1f082f229fc02417ae7c1a30f", 
     "repo_path": "/integration/gaia-central"
 }