test: Remove unused imports

test/functional/wallet_bumpfee.py

@@ -19,7 +19,13 @@ import io
 from test_framework.blocktools import add_witness_commitment, create_block, create_coinbase, send_to_witness
 from test_framework.messages import BIP125_SEQUENCE_NUMBER, CTransaction
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, assert_greater_than, assert_raises_rpc_error, connect_nodes_bi, hex_str_to_bytes, sync_mempools
+from test_framework.util import (
+    assert_equal,
+    assert_greater_than,
+    assert_raises_rpc_error,
+    connect_nodes_bi,
+    hex_str_to_bytes,
+)
 
 WALLET_PASSPHRASE = "test"
 WALLET_PASSPHRASE_TIMEOUT = 3600