Update dependency webpack-cli to v3.3.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
webpack-cli	devDependencies	patch	3.3.7 -> 3.3.8

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Release Notes

webpack/webpack-cli

v3.3.8

Compare Source

Webpack-CLI v3.3.8 comes with a validation bugfix to support webpack 5 and version 4. A full changelog is found here

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