Fix: handle error if getNextUrl throws

[jamfromouterspace]

Problem

If getNextUrl throws an error, the websocket will never be able to reconnect again. For example:

async () => {
    const token = await getToken()
    return baseUrl + token
},

This is because _connect() has no catch to reset _connectLock.

Fix

This simply adds a catch to reset _connectLock and handle the error like any other.

[Lonli-Lokli]

Wow it's really bad - we have a multiple retries to reconnect but still cannot connect due to this failure