remove unused dependencies

[lukeapage]

I couldn't work out why these were present? but maybe there is a reason...

[meinaart]

I think these are needed for socket.io to behave correctly. Especially the uws one. I would need to do a manual test to see if it would still work.

[lukeapage]

It appears to work fine on windows without uws
The documentation suggests uws is only required if the wsEngine property overrides the websocket type and I can't find anywhere in cypress-plugin-snapshots that does that: https://github.com/socketio/engine.io#methods-1

[meinaart]

Merged via #98.