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

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https://hg.mozilla.org/integration/gaia-central/rev/5a394b99e33c
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #22977 from mancas/bug1053684

Bug 1053684 - [Clock] The Alarm sound volume is set at maximum r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/7ca7f7c42760
Author: Manuel Casas Barrado <mancas.91@gmail.com>
Desc: Bug 1053684 - [Clock] The Alarm sound volume is set at maximum after some common operations

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9e047aa77a46334a6fc261c3ea4268c0018ab6d2", 
+    "revision": "5a394b99e33cfa28077f1fa4f011232e225dac55", 
     "repo_path": "/integration/gaia-central"
 }