Fix: serialize version int type

Author: meherett

hdwallet/keys.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright © 2020-2024, Meheret Tesfaye Batu <[email protected]>
+# Copyright © 2020-2025, Meheret Tesfaye Batu <[email protected]>
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or https://opensource.org/license/mit
 
@@ -30,7 +30,7 @@ def serialize(
 ) -> Optional[str]:
     try:
         raw: bytes = (
-            integer_to_bytes(version) if isinstance(version, int) else get_bytes(version) +
+            (integer_to_bytes(version) if isinstance(version, int) else get_bytes(version)) +
             bytes(bytearray([depth])) +
             get_bytes(parent_fingerprint) +
             struct.pack(">L", index) +