update ember-data to ~2.14.2

warp-drive-data/warp-drive#5019

Author: Anthony Kirwan

package.json

@@ -52,7 +52,7 @@
     "ember-cli-sri": "^2.1.0",
     "ember-cli-test-loader": "^1.1.0",
     "ember-cli-uglify": "^1.2.0",
-    "ember-data": "^2.8.0",
+    "ember-data": "~2.14.2",
     "ember-export-application-global": "^1.0.5",
     "ember-load-initializers": "^0.5.1",
     "ember-resolver": "^2.0.3",