Bump cross-env from 5.2.1 to 7.0.3

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 5.2.1 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](kentcdodds/cross-env@v5.2.1...v7.0.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -98,7 +98,7 @@
     "chalk": "^2.4.2",
     "clean-css-cli": "^4.3.0",
     "copyfiles": "^2.2.0",
-    "cross-env": "^5.2.1",
+    "cross-env": "^7.0.3",
     "eslint": "^5.16.0",
     "eslint-plugin-compat": "^2.7.0",
     "foreach-cli": "^1.8.1",