chore(deps-dev): bump nightwatch from 1.5.1 to 1.6.0

Bumps [nightwatch](https://github.com/nightwatchjs/nightwatch) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/nightwatchjs/nightwatch/releases)
- [Commits](https://github.com/nightwatchjs/nightwatch/compare/v1.5.1...v1.6.0)

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

package.json

@@ -150,7 +150,7 @@
     "lint-staged": "=10.5.4",
     "mini-css-extract-plugin": "^1.4.0",
     "mocha": "=8.3.2",
-    "nightwatch": "^1.3.6",
+    "nightwatch": "^1.6.0",
     "node-sass": "^4.14.1",
     "npm-audit-ci-wrapper": "^3.0.0",
     "npm-run-all": "^4.1.5",