gh-105407: Remove unused imports in the stdlib (#105411)

Lib/configparser.py

@@ -147,7 +147,6 @@ import itertools
 import os
 import re
 import sys
-import warnings
 
 __all__ = ("NoSectionError", "DuplicateOptionError", "DuplicateSectionError",
            "NoOptionError", "InterpolationError", "InterpolationDepthError",

Lib/importlib/__init__.py

@@ -54,8 +54,6 @@ _unpack_uint32 = _bootstrap_external._unpack_uint32
 # Fully bootstrapped at this point, import whatever you like, circular
 # dependencies and startup overhead minimisation permitting :)
 
-import warnings
-
 
 # Public API #########################################################
 

Lib/importlib/metadata/__init__.py

@@ -12,7 +12,6 @@ import warnings
 import functools
 import itertools
 import posixpath
-import contextlib
 import collections
 import inspect
 

Lib/turtle.py

@@ -104,7 +104,6 @@ import math
 import time
 import inspect
 import sys
-import warnings
 
 from os.path import isfile, split, join
 from copy import deepcopy

Lib/unittest/main.py

@@ -3,7 +3,6 @@
 import sys
 import argparse
 import os
-import warnings
 
 from . import loader, runner
 from .signals import installHandler