Bug 855507: Update talos.json to capture new xperf main thread I/O counters. r=aki

testing/talos/talos.json

@@ -1,6 +1,6 @@
 {
     "talos.zip": {
-        "url": "http://build.mozilla.org/talos/zips/talos.463cb6875108.zip",
+        "url": "http://build.mozilla.org/talos/zips/talos.560806cfa208.zip",
         "path": ""
     }
 }