chore(deps-dev): bump nightwatch from 2.5.1 to 3.8.0

Bumps [nightwatch](https://github.com/nightwatchjs/nightwatch) from 2.5.1 to 3.8.0.
- [Release notes](https://github.com/nightwatchjs/nightwatch/releases)
- [Commits](nightwatchjs/nightwatch@v2.5.1...v3.8.0)

---
updated-dependencies:
- dependency-name: nightwatch
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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