Update dependency copy-webpack-plugin to v6.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
copy-webpack-plugin	6.3.2 -> 6.4.0

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Release Notes

webpack-contrib/copy-webpack-plugin

### [`v6.4.0`](https://togithub.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md#​640-httpsgithubcomwebpack-contribcopy-webpack-plugincomparev632v640-2020-12-07) [Compare Source](https://togithub.com/webpack-contrib/copy-webpack-plugin/compare/v6.3.2...v6.4.0) ##### Features - added the `info` option ([db53937](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/db53937016b7dbf494bc728f00242cd26541f6a3)) - added type `Function` for the `to` option ([#​563](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/563)) ([9bc5416](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/9bc541694c0d0975c59586cedfea4a51d11f5278)) ##### [6.3.2](https://togithub.com/webpack-contrib/copy-webpack-plugin/compare/v6.3.1...v6.3.2) (2020-11-19) ##### Bug Fixes - watching directories ([#​558](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/558)) ([7b58fd9](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/7b58fd9a89e9b29578b30cb3119453e78e036ec2)) ##### [6.3.1](https://togithub.com/webpack-contrib/copy-webpack-plugin/compare/v6.3.0...v6.3.1) (2020-11-13) ##### Bug Fixes - watching ([#​555](https://togithub.com/webpack-contrib/copy-webpack-plugin/issues/555)) ([b996923](https://togithub.com/webpack-contrib/copy-webpack-plugin/commit/b9969230321df68ed235ed1861729837f234750e))

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