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

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https://hg.mozilla.org/integration/gaia-central/rev/c5bd933fe993
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #16916 from Rik/promise-error-978031

Bug 978031 - Incorrect message after trying to use dialer in Airplane mo... r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/bba5a559125d
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 978031 - Incorrect message after trying to use dialer in Airplane mode

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "f76c9dc32e9eaee5bd9301af9753643f0bf004c3", 
+    "revision": "c5bd933fe99317a7e99822f2d9345ae67a3043df", 
     "repo_path": "/integration/gaia-central"
 }