Bump cross-env from 5.2.0 to 6.0.3 (#12112)

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 5.2.0 to 6.0.3.
- [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...v6.0.3)

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

package.json

@@ -85,7 +85,7 @@
     "classnames": "^2.2.5",
     "compression-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^5.0.4",
-    "cross-env": "^5.1.4",
+    "cross-env": "^6.0.3",
     "css-loader": "^3.2.0",
     "cssnano": "^4.1.10",
     "detect-passive-events": "^1.0.2",