Bump the npm group with 3 updates

Bumps the npm group with 3 updates: [del](https://github.com/sindresorhus/del), [chai](https://github.com/chaijs/chai) and [grunt-nw-builder](https://github.com/nwjs/grunt-nw-builder).


Updates `del` from 7.0.0 to 7.1.0
- [Release notes](https://github.com/sindresorhus/del/releases)
- [Commits](sindresorhus/del@v7.0.0...v7.1.0)

Updates `chai` from 4.3.7 to 4.3.8
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/4.x.x/History.md)
- [Commits](chaijs/chai@v4.3.7...v4.3.8)

Updates `grunt-nw-builder` from 4.0.0-beta.2 to 4.0.0
- [Release notes](https://github.com/nwjs/grunt-nw-builder/releases)
- [Commits](https://github.com/nwjs/grunt-nw-builder/commits/v4.0.0)

---
updated-dependencies:
- dependency-name: del
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm
- dependency-name: chai
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: grunt-nw-builder
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm
...

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