Update dependency webpack to v4.29.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack	devDependencies	minor	4.28.4 -> 4.29.0	source

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Release Notes

webpack/webpack

### [`v4.29.0`](https://togithub.com/webpack/webpack/releases/v4.29.0) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.28.4...v4.29.0) ### Features - update acorn to v6 - limit the number of in parallel written output files to 15 - add `output.futureEmitAssets` which gives the emitting logic of webpack 5 - assets are replaced with SizeOnlySources - reading assets after emitting is no longer allowed - This allows memory to be garbage-collected

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