fix: duplicate import in transaction.py (#857)

Signed-off-by: mukundkumarjha <mukundiiitg@gmail.com>

Author: mukundkumarjha

CHANGELOG.md

@@ -6,6 +6,14 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 
 ## [Unreleased]
 
+### Added
+
+### Changed
+
+- Removed duplicate import of transaction_pb2 in transaction.py
+
+### Fixed
+
 ## [0.1.9] - 2025-11-26
 
 ### Added
@@ -60,6 +68,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 - changed to add concurrency to workflow bot
 - feat: Refactor `TokenDissociateTransaction` to use set_token_ids method and update transaction fee to Hbar, also update `transaction.py` and expand `examples/token_dissociate.py`, `tests/unit/token_dissociate.py`.
 
+
 ### Fixed
 
 - chore: updated solo action to avoid v5

src/hiero_sdk_python/transaction/transaction.py

@@ -9,7 +9,7 @@
 from hiero_sdk_python.crypto.private_key import PrivateKey
 from hiero_sdk_python.exceptions import PrecheckError
 from hiero_sdk_python.executable import _Executable, _ExecutionState
-from hiero_sdk_python.hapi.services import (basic_types_pb2, transaction_pb2, transaction_contents_pb2, transaction_pb2)
+from hiero_sdk_python.hapi.services import (basic_types_pb2, transaction_pb2, transaction_contents_pb2)
 from hiero_sdk_python.hapi.services.schedulable_transaction_body_pb2 import SchedulableTransactionBody
 from hiero_sdk_python.hapi.services.transaction_response_pb2 import (TransactionResponse as TransactionResponseProto)
 from hiero_sdk_python.hbar import Hbar