Bump mock-socket from 8.1.1 to 9.0.2

Bumps [mock-socket](https://github.com/thoov/mock-socket) from 8.1.1 to 9.0.2.
- [Release notes](https://github.com/thoov/mock-socket/releases)
- [Changelog](https://github.com/thoov/mock-socket/blob/master/CHANGELOG.md)
- [Commits](https://github.com/thoov/mock-socket/commits)

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

Author: dependabot-preview[bot]

package.json

@@ -91,7 +91,7 @@
     "karma-jasmine": "^2.0.1",
     "karma-teamcity-reporter": "^1.0.0",
     "leaflet.pm": "^0.25.0",
-    "mock-socket": "^8.0.5",
+    "mock-socket": "^9.0.2",
     "nightwatch": "^0.9.5",
     "open": "^6.0.0",
     "pngjs": "^3.3.0",