Bump copy-webpack-plugin from 4.5.4 to 4.6.0

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 4.5.4 to 4.6.0.
- [Release notes](https://github.com/webpack-contrib/copy-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/copy-webpack-plugin/compare/v4.5.4...v4.6.0

)

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