Bump watchpack from 2.4.0 to 2.4.1

Bumps [watchpack](https://github.com/webpack/watchpack) from 2.4.0 to 2.4.1.
- [Release notes](https://github.com/webpack/watchpack/releases)
- [Commits](webpack/watchpack@v2.4.0...v2.4.1)

---
updated-dependencies:
- dependency-name: watchpack
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>