Bump webpack-cli from 4.6.0 to 5.0.1 in /extensions/ql-vscode (#2181)

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 4.6.0 to 5.0.1.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/webpack-cli@4.6.0...webpack-cli@5.0.1)

---
updated-dependencies:
- dependency-name: webpack-cli
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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