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

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https://hg.mozilla.org/integration/gaia-central/rev/a218828aaed6
Author: James Lal <james@lightsofapollo.com>
Desc: Update taskgraph.json

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https://hg.mozilla.org/integration/gaia-central/rev/fae92816e261
Author: James Lal <james@lightsofapollo.com>
Desc: Update taskgraph.json

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "5bd5379f114f542314571a0361089cfd5beb5827", 
+    "revision": "a218828aaed6dbdc6d8bbf54df898c2c72276e6c", 
     "repo_path": "/integration/gaia-central"
 }