Update dependency webpack to v4.31.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack	dependencies	minor	4.30.0 -> 4.31.0	source

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Release Notes

webpack/webpack

### [`v4.31.0`](https://togithub.com/webpack/webpack/releases/v4.31.0) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.30.0...v4.31.0) ### Features - add `errors-warnings` stats preset ### Bugfixes - allow top-level return in non-ESM modules

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