fs: ssh: pass timeout to paramiko's connect() (#5569)

Prior to this commit, DVC could hang indefinitely when connecting to
remote SSH filesystems. This should address this.

dvc/fs/ssh/connection.py

@@ -40,7 +40,9 @@ class SSHConnection:
                 host=host, **kwargs
             )
         )
-        self.timeout = kwargs.get("timeout", 1800)
+
+        kwargs.setdefault("timeout", 1800)
+        self.timeout = kwargs["timeout"]
 
         self._ssh = paramiko.SSHClient()