Update dependency webpack to v4.40.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack	devDependencies	patch	4.40.0 -> 4.40.1

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Release Notes

webpack/webpack

### [`v4.40.1`](https://togithub.com/webpack/webpack/releases/v4.40.1) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.40.0...v4.40.1) ### Bugfixes - convert "multiple assets emit to the same filename" error into a warning - compare asset content when multiple assets emit to the same filename

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