fix: Fix logging format string in SSL connection debug message

Author: Luis Garza

redshift_connector/core.py

@@ -662,7 +662,7 @@ def get_calling_module() -> str:
                     self._usock.sendall(ii_pack(8, 80877103))
                     resp: bytes = self._usock.recv(1)
                     if resp != b"S":
-                        _logger.debug("Server response code when attempting to establish ssl connection: $s", resp)
+                        _logger.debug("Server response code when attempting to establish ssl connection: %s", resp)
                         raise InterfaceError("Server refuses SSL")
 
                     if sslmode == "verify-ca":