WebSocketServer lingers on update

[Sidiousious]

When the plugin is updated, the previous websocket server continues running on the configured port. The new version on init prints error as the port is already occupied:

15:14:36.544 | ERR | [IINACT] [OverlayPlugin] WS: Failed to start: System.Net.Sockets.SocketException (10013): Access denied.
	   at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, Boolean disconnectOnFailure, String callerName)
	   at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
	   at System.Net.Sockets.Socket.Bind(EndPoint localEP)
	   at NetCoreServer.TcpServer.Start()
	   at RainbowMage.OverlayPlugin.WebSocket.ServerController.Start() in /home/runner/work/IINACT/IINACT/OverlayPlugin.Core/WebSocket/ServerController.cs:line 75

[marzent]

This should not be possible, as the WebSocketServer gets properly disposed of during unload... Most likely something crashed somewhere for that to happen (a larger log excerpt also showing the unload would be interesting here).