chore(deps-dev): bump watchpack from 2.4.4 to 2.5.1

Bumps [watchpack](https://github.com/webpack/watchpack) from 2.4.4 to 2.5.1.
- [Release notes](https://github.com/webpack/watchpack/releases)
- [Commits](webpack/watchpack@v2.4.4...v2.5.1)

---
updated-dependencies:
- dependency-name: watchpack
  dependency-version: 2.5.1
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]