Update dependency webpack to v4.40.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
webpack	devDependencies	minor	4.39.3 -> 4.40.2

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Release Notes

webpack/webpack

v4.40.2

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Bugfixes

• fix a bug where asset is undefined

v4.40.1

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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

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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

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