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](https://github.com/kentcdodds/cross-env/compare/v6.0.3...v7.0.2)

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

package.json

@@ -12,7 +12,7 @@
     "chalk": "^4.0.0",
     "clean-css-cli": "^4.3.0",
     "core-js": "^3.1.4",
-    "cross-env": "^6.0.3",
+    "cross-env": "^7.0.2",
     "eslint": "^6.0.0",
     "esm": "^3.2.25",
     "foreach-cli": "^1.8.1",