Bump cross-env from 6.0.0 to 6.0.3

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 6.0.0 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/v6.0.0...v6.0.3)

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

packages/tutorial/package.json

@@ -54,7 +54,7 @@
     "@freesewing/plugin-flip": "^2.1.0",
     "@freesewing/utils": "^2.1.0",
     "@svgr/rollup": "^2.4.1",
-    "cross-env": "^5.1.4",
+    "cross-env": "^6.0.3",
     "gh-pages": "^1.2.0",
     "react-scripts": "^3.0.0",
     "webpack": "4.29.6",