Bump golang.org/x/crypto to 0.17.0 (security)

[bsiegert]

This fixes the following vulnerabilities, as reported by govulncheck:

Vulnerability #1: GO-2023-2402
    Man-in-the-middle attacker can compromise integrity of secure channel in
    golang.org/x/crypto
  More info: https://pkg.go.dev/vuln/GO-2023-2402
  Module: golang.org/x/crypto
    Found in: golang.org/x/[email protected]
    Fixed in: golang.org/x/[email protected]
    Example traces found:
      #1: work/ssh-chat-1.10/sshd/client.go:42:33: sshd.ConnectShell calls ssh.Client.NewSession
      #2: work/ssh-chat-1.10/sshd/client.go:36:23: sshd.ConnectShell calls ssh.Dial
      #3: work/ssh-chat-1.10/sshd/net.go:49:2: sshd.SSHListener.handleConn calls ssh.DiscardRequests
      #4: work/ssh-chat-1.10/sshd/net.go:43:55: sshd.SSHListener.handleConn calls ssh.NewServerConn
      #5: work/ssh-chat-1.10/sshd/terminal.go:222:13: sshd.Terminal.listen calls ssh.Request.Reply
      #6: work/ssh-chat-1.10/sshd/client.go:46:2: sshd.ConnectShell calls ssh.Session.Close
      #7: work/ssh-chat-1.10/sshd/client.go:70:30: sshd.ConnectShell calls ssh.Session.SendRequest
      #8: work/ssh-chat-1.10/sshd/client.go:65:21: sshd.ConnectShell calls ssh.Session.Shell
      #9: work/ssh-chat-1.10/cmd/ssh-chat/cmd.go:243:14: ssh.main calls fmt.Fprintln, which eventually calls ssh.channel.Read
      #10: work/ssh-chat-1.10/sshd/terminal/terminal.go:954:17: terminal.Terminal.SetBracketedPasteMode calls io.WriteString, which calls ssh.channel.Write
      #11: work/ssh-chat-1.10/cmd/ssh-chat/cmd.go:243:14: ssh.main calls fmt.Fprintln, which eventually calls ssh.extChannel.Read

Vulnerability #4: GO-2022-0968
    Panic on malformed packets in golang.org/x/crypto/ssh
  More info: https://pkg.go.dev/vuln/GO-2022-0968
  Module: golang.org/x/crypto
    Found in: golang.org/x/[email protected]
    Fixed in: golang.org/x/[email protected]
    Example traces found:
      #1: work/ssh-chat-1.10/sshd/client.go:36:23: sshd.ConnectShell calls ssh.Dial
      #2: work/ssh-chat-1.10/sshd/net.go:43:55: sshd.SSHListener.handleConn calls ssh.NewServerConn

Vulnerability #5: GO-2021-0356
    Denial of service via crafted Signer in golang.org/x/crypto/ssh
  More info: https://pkg.go.dev/vuln/GO-2021-0356
  Module: golang.org/x/crypto
    Found in: golang.org/x/[email protected]
    Fixed in: golang.org/x/[email protected]
    Example traces found:
      #1: work/ssh-chat-1.10/cmd/ssh-chat/cmd.go:122:19: ssh.main calls ssh.ServerConfig.AddHostKey

Vulnerability #6: GO-2021-0227
    Panic on crafted authentication request message in golang.org/x/crypto/ssh
  More info: https://pkg.go.dev/vuln/GO-2021-0227
  Module: golang.org/x/crypto
    Found in: golang.org/x/[email protected]
    Fixed in: golang.org/x/[email protected]
    Example traces found:
      #1: work/ssh-chat-1.10/sshd/net.go:43:55: sshd.SSHListener.handleConn calls ssh.NewServerConn

[shazow]

Thank you!