build(deps): bump engine.io in /openvidu-server/src/dashboard

Bumps [engine.io](https://github.com/socketio/engine.io) from 6.1.0 to 6.1.2.
- [Release notes](https://github.com/socketio/engine.io/releases)
- [Changelog](https://github.com/socketio/engine.io/blob/master/CHANGELOG.md)
- [Commits](https://github.com/socketio/engine.io/compare/6.1.0...6.1.2)

---
updated-dependencies:
- dependency-name: engine.io
  dependency-type: indirect
...

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

openvidu-server/src/dashboard/package-lock.json

@@ -4335,9 +4335,9 @@
       }
     },
     "engine.io": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.1.0.tgz",
-      "integrity": "sha512-ErhZOVu2xweCjEfYcTdkCnEYUiZgkAcBBAhW4jbIvNG8SLU3orAqoJCiytZjYF7eTpVmmCrLDjLIEaPlUAs1uw==",
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.1.2.tgz",
+      "integrity": "sha512-v/7eGHxPvO2AWsksyx2PUsQvBafuvqs0jJJQ0FdmJG1b9qIvgSbqDRGwNhfk2XHaTTbTXiC4quRE8Q9nRjsrQQ==",
       "dev": true,
       "requires": {
         "@types/cookie": "^0.4.1",