Bump watchpack from 1.7.2 to 1.7.4 (#14448)

Bumps [watchpack](https://github.com/webpack/watchpack) from 1.7.2 to 1.7.4.
- [Release notes](https://github.com/webpack/watchpack/releases)
- [Commits](https://github.com/webpack/watchpack/compare/v1.7.2...v1.7.4

)

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