Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5c083c0441b0
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #23243 from jee1mr/Bug-928012

Bug 928012 - Contacts should use generic 'memory card' instead of SD

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https://hg.mozilla.org/integration/gaia-central/rev/fe7be7550d3f
Author: jee1mr <14.jeevan@gmail.com>
Desc: Bug 928012 - Contacts should use generic 'memory card' instead of SD

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https://hg.mozilla.org/integration/gaia-central/rev/79111bb2bef9
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #23854 from rnowm/1064744

Bug 1064744 - [BB] Update Toolbar to latest VD r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/2ffe42472926
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1064744 - [BB] Update Toolbar to latest VD

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "db23eae83dadbbe311aadb72cbea0f33d5657da1", 
+    "revision": "5c083c0441b0158afc0152d0b741887743fa831f", 
     "repo_path": "/integration/gaia-central"
 }