Bump open from 7.4.2 to 8.4.0

Bumps [open](https://github.com/sindresorhus/open) from 7.4.2 to 8.4.0.
- [Release notes](https://github.com/sindresorhus/open/releases)
- [Commits](sindresorhus/open@v7.4.2...v8.4.0)

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

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

Author: dependabot[bot]

package.json

@@ -96,7 +96,7 @@
     "mini-css-extract-plugin": "^1.1.0",
     "mock-socket": "^9.0.3",
     "nightwatch": "^1.4.3",
-    "open": "^7.3.0",
+    "open": "^8.4.0",
     "pngjs": "^6.0.0",
     "pre-commit": "^1.2.2",
     "request": "^2.88.0",