IPv6 support in `scag-client`

[woju]

Description of the problem

scag-client fails to set up TLS connection over IPv6

Steps to reproduce

1.7~rc2

Have a dual-stack host that resolves a name with both IPv4 and IPv6, e.g.:

127.0.0.1 localhost
::1 localhost

Then scag-client -C . https://localhost:8080/

Expected results

It successfully attests the enclave.

Actual results

$ scag-client -C . --allow-outdated-tcb-insecure https://localhost6:8080/
Traceback (most recent call last):
  File "/usr/bin/scag-client", line 8, in <module>
    sys.exit(client())
             ^^^^^^^^
  File "/usr/lib/python3/dist-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/graminescaffolding/__main__.py", line 308, in client
    resp = _client.request(method, url, verify_cb=verify_cb)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/graminescaffolding/client.py", line 26, in request
    conn.connect()
  File "/usr/lib/python3.11/http/client.py", line 1454, in connect
    self.sock = self._context.wrap_socket(self.sock,
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/ssl.py", line 517, in wrap_socket
    return self.sslsocket_class._create(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/ssl.py", line 1075, in _create
    self.do_handshake()
  File "/usr/lib/python3.11/ssl.py", line 1346, in do_handshake
    self._sslobj.do_handshake()
ConnectionResetError: [Errno 104] Connection reset by peer