Make ruff happier

Fix ruff errors missed in previous commit.

Signed-off-by: Michael Tiemann <[email protected]>

pint/compat.py

@@ -17,7 +17,7 @@
 from numbers import Number
 from collections.abc import Mapping
 from typing import Any, NoReturn, Callable, Optional, Union
-from collections.abc import Generator, Iterable
+from collections.abc import Iterable
 
 try:
     from uncertainties import UFloat, ufloat

pint/toktest.py

@@ -1,13 +1,6 @@
-import pint
-from pint import Quantity as Q_
 
-import re
 import tokenize
-from tokenize import NUMBER, STRING, NAME, OP
-import token as tokenlib
-from io import BytesIO
 from pint.pint_eval import _plain_tokenizer, uncertainty_tokenizer
-from pint.pint_eval import tokens_with_lookahead
 
 tokenizer = _plain_tokenizer