remove unused import

Author: asherf

jose/backends/cryptography_backend.py

@@ -3,7 +3,6 @@
 
 from cryptography.exceptions import InvalidSignature, InvalidTag
 from cryptography.hazmat.backends import default_backend
-from cryptography.hazmat.bindings.openssl.binding import Binding
 from cryptography.hazmat.primitives import hashes, hmac, serialization
 from cryptography.hazmat.primitives.asymmetric import ec, padding, rsa
 from cryptography.hazmat.primitives.asymmetric.utils import decode_dss_signature, encode_dss_signature