Update keystore.py

The current version doesn't work for me (relatively fresh Ubuntu 24.04 install). This fixes it.

staking_deposit/key_handling/keystore.py

@@ -61,9 +61,9 @@ class KeystoreModule(BytesDataclass):
 
 @dataclass
 class KeystoreCrypto(BytesDataclass):
-    kdf: KeystoreModule = KeystoreModule()
-    checksum: KeystoreModule = KeystoreModule()
-    cipher: KeystoreModule = KeystoreModule()
+    kdf: KeystoreModule = dataclass_field(default_factory=KeystoreModule)
+    checksum: KeystoreModule = dataclass_field(default_factory=KeystoreModule)
+    cipher: KeystoreModule = dataclass_field(default_factory=KeystoreModule)
 
     @classmethod
     def from_json(cls, json_dict: Dict[Any, Any]) -> 'KeystoreCrypto':
@@ -81,7 +81,7 @@ class Keystore(BytesDataclass):
 
     Ref: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-2335.md
     """
-    crypto: KeystoreCrypto = KeystoreCrypto()
+    crypto: KeystoreCrypto = dataclass_field(default_factory=KeystoreCrypto)
     description: str = ''
     pubkey: str = ''
     path: str = ''
@@ -161,10 +161,9 @@ def decrypt(self, password: str) -> bytes:
         cipher = AES_128_CTR(key=decryption_key[:16], **self.crypto.cipher.params)
         return cipher.decrypt(self.crypto.cipher.message)
 
-
 @dataclass
 class Pbkdf2Keystore(Keystore):
-    crypto: KeystoreCrypto = KeystoreCrypto(
+    crypto: KeystoreCrypto = dataclass_field(default_factory=lambda: KeystoreCrypto(
         kdf=KeystoreModule(
             function='pbkdf2',
             params={
@@ -179,12 +178,11 @@ class Pbkdf2Keystore(Keystore):
         cipher=KeystoreModule(
             function='aes-128-ctr',
         )
-    )
-
+    ))
 
 @dataclass
 class ScryptKeystore(Keystore):
-    crypto: KeystoreCrypto = KeystoreCrypto(
+    crypto: KeystoreCrypto = dataclass_field(default_factory=lambda: KeystoreCrypto(
         kdf=KeystoreModule(
             function='scrypt',
             params={
@@ -200,4 +198,4 @@ class ScryptKeystore(Keystore):
         cipher=KeystoreModule(
             function='aes-128-ctr',
         )
-    )
+    ))