CONNECT requests fail under proxy connections.

[VegieIsCute]

Describe the bug
When a proxy is applied, and a connect request is made, the request fails with the error "proxy connection timeout" immediately.

To Reproduce

session := azuretls.NewSession()
defer session.Close()
_ = session.SetProxy("YOUR PROXY")
err := session.Connect("http://tls.peet.ws:443")
if err != nil {
    fmt.Println(err)
}

Expected behavior
CONNECT requests to succeed even under proxies.

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Browser Firefox
• Version 128

[Noooste]

Thanks for reporting me this, will be patched asap!