Bump webpack-assets-manifest from 3.1.1 to 4.0.0 (#15288)

Bumps [webpack-assets-manifest](https://github.com/webdeveric/webpack-assets-manifest) from 3.1.1 to 4.0.0.
- [Release notes](https://github.com/webdeveric/webpack-assets-manifest/releases)
- [Commits](https://github.com/webdeveric/webpack-assets-manifest/compare/v3.1.1...v4.0.0

)

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