Update dependency webpack to v4.28.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack	devDependencies	minor	4.27.1 -> 4.28.0	source

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Release Notes

webpack/webpack

### [`v4.28.0`](https://renovatebot.com/gh/webpack/webpack/releases/v4.28.0) [Compare Source](https://renovatebot.com/gh/webpack/webpack/compare/v4.27.1...v4.28.0) ### Features - IgnorePlugin: `checkResource` has an additional `context` argument ### Bugfixes - Injection of node.js globals has been disabled for `.mjs` files as it's crashing

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