Fix: Solve typing issue passing the chain argument.

Author: Andres D. Molins

src/aleph/sdk/types.py

@@ -6,7 +6,7 @@
 
 __all__ = ("StorageEnum", "Account", "AccountFromPrivateKey", "GenericMessage")
 
-from aleph_message.models import AlephMessage
+from aleph_message.models import AlephMessage, Chain
 
 
 class StorageEnum(str, Enum):
@@ -35,7 +35,7 @@ def get_public_key(self) -> str: ...
 class AccountFromPrivateKey(Account, Protocol):
     """Only accounts that are initialized from a private key string are supported."""
 
-    def __init__(self, private_key: bytes): ...
+    def __init__(self, private_key: bytes, chain: Chain): ...
 
     async def sign_raw(self, buffer: bytes) -> bytes: ...