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

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https://hg.mozilla.org/integration/gaia-central/rev/5101679e2445
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #17971 from rnowm/992121

Bug 992121 - [Settings] not showing correct spinner r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/18b2ece56635
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 992121 - [Settings] not showing correct spinner

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "3ea3e7acebbf09e616d0947b6a220b9522092ab4", 
+    "revision": "5101679e2445a3044f125b3d63c586108c7b3616", 
     "repo_path": "/integration/gaia-central"
 }