Use hemilabs/websocket fork of nhooyr.io/websocket

[joshuasing]

Summary
Use https://github.com/hemilabs/websocket fork of nhooyr.io/websocket library

The WASM implementation of the WebSocket connection in nhooyr.io/websocket contains a bug that causes net.ErrClosed to always be returned when the connection is closed, meaning the underlying websocket.CloseError to never be returned and we can't retrieve the close code or reason. This fork contains a fix that returns the close error correctly. This patch will hopefully be upstreamed at a later date, once we are able to confirm that this fix is working correctly and doesn't change anything else.

Tested by running the web/integrationtest and providing a private key that is not authorised on the BFG server.
The exit behaviour now matches the popmd daemon.

Changes

• Use github.com/hemilabs/websocket instead of nhooyr.io/websocket (likely temporarily)

[jcvernaleo]

OK

[marcopeereboom]

I really would like to use upstream code but for now this makes sense.