Update dependency webpack to v4.29.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack	dependencies	patch	4.29.5 -> 4.29.6	source

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Release Notes

webpack/webpack

### [`v4.29.6`](https://togithub.com/webpack/webpack/releases/v4.29.6) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.29.5...v4.29.6) ### Bugfixes - typeof `__webpack_require__` and `require.onError` is no longer evaluated to `undefined` and evaluation is done at runtime instead. - `this` value in `module.hot.accept` with imported dependency is correctly preserved. - webassemblyjs updated to latest version ### Contributing - added a linting step to ensure all dependencies resolve to `npm` modules

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