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I think fixing all affected calls to socket.close in the world (option 3) would be too much. I just added two new reports (Issue 30652 and Issue 30391) as dependencies. These are about testing socketserver.TCPServer. As an example, to fix the socket.close call there, I think the change would look like
class TCPServer:
 def close_request(self, request):
 try:
 request.close()
 except ConnectionError:
 # Suppress asynchronous errors such as ECONNRESET on Free BSD
 pass
Instead of that change all over the place, I am thinking option 2 would be safest. In Modules/socketmodule.c, something like
sock_close(PySocketSockObject *s)
{
 Py_BEGIN_ALLOW_THREADS
 res = SOCKETCLOSE(fd);
 Py_END_ALLOW_THREADS
 /* ECONNRESET can occur on Free BSD */
 if (res < 0 && errno != ECONNRESET) {
 return s->errorhandler();
 }
}