Bump cross-env from 6.0.3 to 7.0.2

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 6.0.3 to 7.0.2.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](kentcdodds/cross-env@v6.0.3...v7.0.2)

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

Author: dependabot-preview[bot]

package.json

@@ -72,7 +72,7 @@
     "chromedriver": "75.1.0",
     "clean-css-cli": "^4.3.0",
     "commander": "^4.0.1",
-    "cross-env": "^6.0.3",
+    "cross-env": "^7.0.2",
     "css-loader": "^3.2.0",
     "es3ify-loader": "^0.2.0",
     "eslint": "^6.8.0",