Bump cross-env from 5.2.0 to 7.0.3

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 5.2.0 to 7.0.3.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kentcdodds/cross-env/compare/v5.2.0...v7.0.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -83,7 +83,7 @@
     "chai": "^4.2.0",
     "chalk": "^2.1.0",
     "copy-webpack-plugin": "^5.0.5",
-    "cross-env": "^5.0.5",
+    "cross-env": "^7.0.3",
     "css-loader": "^0.28.4",
     "del": "^3.0.0",
     "devtron": "^1.4.0",