Update dependency webpack to v4.19.1

[renovate]

This Pull Request updates dependency webpack (source) from v4.18.0 to v4.19.1

Release Notes

v4.19.1

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Bugfixes

• Internal requested filename for import() with target: "electron-main" uses correct path separator on windows
  (This fixes a problem with filemappings in vscode)
• devtool: "source-map" and variants generate SourceMaps when output file is .mjs
• browser field as object is used when using target: "electron-renderer"
• Comments near export default are preserved
• Passing an array as externals value, now works correctly as documented

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v4.19.0

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Bugfixes

• Create a hash of the whole runtime code for the chunk/contenthash of entry chunks
  • Before hash was (incorrectly) calculated from (some) inputs

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v4.18.1

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Bugfixes

• Update tapable version, which fixes a memory leak

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This PR has been generated by Renovate Bot.