Update dependency webpack to v4.40.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webpack	devDependencies	minor	4.39.2 -> 4.40.2

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Release Notes

webpack/webpack

### [`v4.40.2`](https://togithub.com/webpack/webpack/releases/v4.40.2) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.40.1...v4.40.2) ### Bugfixes - fix a bug where asset is undefined ### [`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 ### [`v4.40.0`](https://togithub.com/webpack/webpack/releases/v4.40.0) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.39.3...v4.40.0) ### Features - adds asset info for emitted assets - new methods allow easy emitting/updating of assets `compilation.emitAsset/updateAsset` (instead of accessing the Object `compilation.assets`) - new getter methods to get assets `compilation.getAssets()` and `compilation.getAsset(name)` - 3 flags in asset info: - `immutable`: when set an asset can be cache infinitely - `development`: when set an asset is some kind of development tool (i. e. a SourceMap) - `hotModuleReplacement`: when set an asset is generated for an hot update - Stats expose `info` object in assets - String version of Stats show flags ### [`v4.39.3`](https://togithub.com/webpack/webpack/releases/v4.39.3) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.39.2...v4.39.3) ### Bugfixes - fix a missing module in chunk caused by incorrect chunk graph generation of async chunks

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