Update dependency webpack-cli to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack-cli	devDependencies	major	3.3.12 -> 4.0.0

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Release Notes

webpack/webpack-cli

### [`v4.0.0`](https://togithub.com/webpack/webpack-cli/blob/master/CHANGELOG.md#​400-httpsgithubcomwebpackwebpack-clicomparewebpack-cli400-rc1webpack-cli400-2020-10-10) [Compare Source](https://togithub.com/webpack/webpack-cli/compare/v3.3.12...webpack-cli@4.0.0) ##### Bug Fixes - add compilation lifecycle in watch instance ([#​1903](https://togithub.com/webpack/webpack-cli/issues/1903)) ([02b6d21](https://togithub.com/webpack/webpack-cli/commit/02b6d21eaa20166a7ed37816de716b8fc22b756a)) - cleanup `package-utils` package ([#​1822](https://togithub.com/webpack/webpack-cli/issues/1822)) ([fd5b92b](https://togithub.com/webpack/webpack-cli/commit/fd5b92b3cd40361daec5bf4486e455a41f4c9738)) - cli-executer supplies args further up ([#​1904](https://togithub.com/webpack/webpack-cli/issues/1904)) ([097564a](https://togithub.com/webpack/webpack-cli/commit/097564a851b36b63e0a6bf88144997ef65aa057a)) - exit code for validation errors ([59f6303](https://togithub.com/webpack/webpack-cli/commit/59f63037fcbdbb8934b578b9adf5725bc4ae1235)) - exit process in case of schema errors ([71e89b4](https://togithub.com/webpack/webpack-cli/commit/71e89b4092d953ea587cc4f606451ab78cbcdb93)) ##### Features - assign config paths in build dependencies in cache config ([#​1900](https://togithub.com/webpack/webpack-cli/issues/1900)) ([7e90f11](https://togithub.com/webpack/webpack-cli/commit/7e90f110b119f36ef9def4f66cf4e17ccf1438cd))

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