Fix lints

src/allmydata/storage_client.py

@@ -32,7 +32,6 @@ Ported to Python 3.
 
 from __future__ import annotations
 
-from six import ensure_text
 from typing import Union, Callable, Any, Optional, cast, Dict
 from os import urandom
 import re

src/allmydata/test/test_eliotutil.py

@@ -47,7 +47,6 @@ from eliot import (
     Message,
     MessageType,
     fields,
-    FileDestination,
     MemoryLogger,
 )
 from eliot.twisted import DeferredContext