build(deps-dev): 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] <[email protected]>

Author: dependabot-preview[bot]

Diff for: package.json

@@ -98,7 +98,7 @@
     "babel-loader": "^8.0.4",
     "codesandbox": "~2.1.10",
     "coveralls": "^3.0.1",
-    "cross-env": "^6.0.3",
+    "cross-env": "^7.0.2",
     "enzyme": "^3.10.0",
     "enzyme-adapter-react-16": "^1.14.0",
     "eslint": "^6.6.0",