Bump cross-env from 7.0.2 to 7.0.3

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 7.0.2 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@v7.0.2...v7.0.3)

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

Author: dependabot[bot]

package.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "autoprefixer": "9.8.6",
     "clean-webpack-plugin": "3.0.0",
-    "cross-env": "7.0.2",
+    "cross-env": "7.0.3",
     "css-loader": "5.0.1",
     "fibers": "5.0.0",
     "mini-css-extract-plugin": "1.3.1",