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

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https://hg.mozilla.org/integration/gaia-central/rev/f64206f59b37
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #26300 from azasypkin/pr-25734

1090867 - [Messages][Refactoring] Don't consider cancelled activity as unhandled error r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/38b8a3bf0148
Author: solfen <solfen@hotmail.com>
Desc: 1090867 - [Messages][Refactoring] Don't consider cancelled activity as unhandled error r=azasypkin

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ee4c883c364f0a2e8ea8ca1f522ef8efca575501", 
+    "revision": "f64206f59b377602789336c64ece84ca0533714c", 
     "repo_path": "integration/gaia-central"
 }