Update cross-env to the latest version 🚀 (#6058)

* chore(package): update cross-env to version 6.0.0

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -71,7 +71,7 @@
     "apollo-utilities": "1.3.2",
     "babel-eslint": "10.0.3",
     "bcrypt-nodejs": "0.0.3",
-    "cross-env": "5.2.1",
+    "cross-env": "6.0.0",
     "deep-diff": "1.0.2",
     "eslint": "6.4.0",
     "eslint-plugin-flowtype": "4.3.0",