Update dependency cross-env to v7

Author: renovate-bot

package-lock.json

@@ -32,7 +32,7 @@
     "@cypress/webpack-preprocessor": "4.1.3",
     "babel-loader": "8.0.6",
     "babel-plugin-istanbul": "5.2.0",
-    "cross-env": "5.2.1",
+    "cross-env": "7.0.2",
     "cypress": "3.8.3",
     "html-webpack-plugin": "3.2.0",
     "istanbul-lib-coverage": "2.0.5",