Bump watchpack from 1.6.0 to 1.6.1 (#13462)

Bumps [watchpack](https://github.com/webpack/watchpack) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/webpack/watchpack/releases)
- [Commits](https://github.com/webpack/watchpack/compare/v1.6.0...v1.6.1

)

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