Update dependency copy-webpack-plugin to v6.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
copy-webpack-plugin	devDependencies	patch	6.1.0 -> 6.1.1

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Release Notes

webpack-contrib/copy-webpack-plugin

### [`v6.1.1`](https://togithub.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md#​611-httpsgithubcomwebpack-contribcopy-webpack-plugincomparev610v611-2020-09-18) [Compare Source](https://togithub.com/webpack-contrib/copy-webpack-plugin/compare/v6.1.0...v6.1.1)

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