ssh-audit fails when scanning multiple hosts against a policy.

[hamarituc]

How to reproduce

Run ssh-audit version 3.2.0 with the -P and the -T parameter.

Observed behavior

$ ssh-audit -jj -P policy.txt -T ips.txt 
[Traceback (most recent call last):
  File "/XXX/virtualenv/keycheck/bin/ssh-audit", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/XXX/virtualenv/keycheck/lib/python3.11/site-packages/ssh_audit/ssh_audit.py", line 1603, in main
    worker_ret, worker_output = future.result()
                                ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/concurrent/futures/_base.py", line 449, in result
    return self.__get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/usr/lib/python3.11/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/XXX/virtualenv/keycheck/lib/python3.11/site-packages/ssh_audit/ssh_audit.py", line 1442, in target_worker_thread
    my_aconf = copy.deepcopy(shared_aconf)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 271, in _reconstruct
    state = deepcopy(state, memo)
            ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 146, in deepcopy
    y = copier(x, memo)
        ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 231, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
                             ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 172, in deepcopy
    y = _reconstruct(x, memo, *rv)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 271, in _reconstruct
    state = deepcopy(state, memo)
            ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 146, in deepcopy
    y = copier(x, memo)
        ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 231, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
                             ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/copy.py", line 161, in deepcopy
    rv = reductor(4)
         ^^^^^^^^^^^
TypeError: cannot pickle '_io.TextIOWrapper' object

Additional context

A deep copy of a configuration object is created in ssh_audit.py:1442. This object itself refers to a Policy object which has a property _warning_target set to either sys.stderr (JSON mode) or sys.stdout (normal mode). This object cannot be deep-copied as it contains a non-serializable state (e.g. file position pointer).