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

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https://hg.mozilla.org/integration/gaia-central/rev/a91a7956eb49
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #14564 from EragonJ/bug-948769

Bug 948769 - [Settings][DSDS] Default service ID should be a number

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https://hg.mozilla.org/integration/gaia-central/rev/302a148e42af
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 948769 - [Settings][DSDS] Default service ID should be a number

- make all settings from String to Number

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "8657b910fdcdb4065063ee7317152a6375fce6c6", 
+    "revision": "a91a7956eb49a8559ce3aec5595134f5e5e9ac5c", 
     "repo_path": "/integration/gaia-central"
 }