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

========

https://hg.mozilla.org/integration/gaia-central/rev/a9373a0a5aa0
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #22012 from rnowm/1041779

Bug 1041779 - [Messages][MMS] Download button styles are broken r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/710a36fc48ef
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1041779 - [Messages][MMS] Download button styles are broken

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "110dabbb513a86f516a5d99fc11d28da2d4d8fb8", 
+    "revision": "a9373a0a5aa0a03e259bb25765e350cf2e9e1a77", 
     "repo_path": "/integration/gaia-central"
 }