Pool leaves socket open when authentication fails

test_client_handshake_saslSupportedMechs (tests.test_handshake.TestHandshake) ... /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/traceback.py:220: ResourceWarning: unclosed <socket.socket fd=8, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('127.0.0.1', 56287), raddr=('127.0.0.1', 56285)>

  tb.tb_frame.clear()

Object allocated at (most recent call last):

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 890

    self._bootstrap_inner()

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 932

    self.run()

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 870

    self._target(*self._args, **self._kwargs)

  File "/Users/shane/git/pymongo-mockup-tests/venv/python3.8/lib/python3.8/site-packages/mockupdb/__init__.py", lineno 135

    result[0] = fn(*args, **kwargs)

  File "/Users/shane/git/mongo-python-driver/pymongo/database.py", lineno 736

    with self.__client._socket_for_reads(

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", lineno 113

    return next(self.gen)

  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", lineno 1319

    with self._get_socket(server, session) as sock_info:

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", lineno 113

    return next(self.gen)

  File "/Users/shane/git/mongo-python-driver/pymongo/mongo_client.py", lineno 1238

    with server.get_socket(

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", lineno 113

    return next(self.gen)

  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1164

    sock_info = self._get_socket(all_credentials)

  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1211

    sock_info = self.connect(all_credentials)

  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1122

    sock = _configured_socket(self.address, self.opts)

  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 929

    sock = _create_connection(address, options)

  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 891

    sock = socket.socket(

ok