Update dependency webpack to v4.20.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack	dependencies	minor	4.19.1 -> 4.20.2	source

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Release Notes

webpack/webpack

v4.20.2

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Bugfixes

• keep comments in export default in concatenated modules

v4.20.1

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Bugfixes

• fix crash when using libraryTarget: "amd" without library name

v4.20.0

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Bugfixes

• update dependencies (webpack-sources, @​webassemblyjs/*)
• Handle errors thrown in renderes without crashing

Internal changes

• Extended typings
• Update internal structure of options schema to generate typings
  • Note: this exposed an issue in webpack-cli, you need to upgrade to [email protected]

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