fix: Cleanup code to follow linting

sol.py

@@ -1,9 +1,6 @@
-from solders.keypair import Keypair
 from solders.pubkey import Pubkey
 from solana.rpc.api import Client
 from solders.system_program import TransferParams, transfer
-from solders.transaction import Transaction
-from solders.hash import Hash
 from solders.message import MessageV0
 from solders.transaction import VersionedTransaction
 from solders.null_signer import NullSigner