Use imports instead of TypeAliases in a couple places (#7634)

Fixes #7632

stdlib/imaplib.pyi

@@ -2,10 +2,11 @@ import subprocess
 import sys
 import time
 from _typeshed import Self
+from builtins import list as _list  # conflicts with a method named "list"
 from socket import socket as _socket
 from ssl import SSLContext, SSLSocket
 from types import TracebackType
-from typing import IO, Any, Callable, Pattern, TypeVar
+from typing import IO, Any, Callable, Pattern
 from typing_extensions import Literal, TypeAlias
 
 __all__ = ["IMAP4", "IMAP4_stream", "Internaldate2tuple", "Int2AP", "ParseFlags", "Time2Internaldate", "IMAP4_SSL"]
@@ -16,9 +17,6 @@ _CommandResults: TypeAlias = tuple[str, list[Any]]
 
 _AnyResponseData: TypeAlias = list[None] | list[bytes | tuple[bytes, bytes]]
 
-_T = TypeVar("_T")
-_list: TypeAlias = list[_T]  # conflicts with a method named "list"
-
 class IMAP4:
     error: type[Exception]
     abort: type[Exception]

stubs/requests/requests/sessions.pyi

@@ -1,14 +1,12 @@
 from _typeshed import Self, SupportsItems
-from typing import IO, Any, Callable, Iterable, Mapping, MutableMapping, TypeVar, Union
+from typing import IO, Any, Callable, Iterable, Mapping, MutableMapping, Union
 from typing_extensions import TypeAlias
 
-from urllib3 import _collections
+from urllib3._collections import RecentlyUsedContainer
 
-from . import adapters, auth as _auth, compat, cookies, exceptions, hooks, models, status_codes, structures, utils
+from . import adapters, auth as _auth, compat, cookies, exceptions, hooks, models, status_codes, utils
 from .models import Response
-
-_KT = TypeVar("_KT")
-_VT = TypeVar("_VT")
+from .structures import CaseInsensitiveDict as CaseInsensitiveDict
 
 _BaseAdapter = adapters.BaseAdapter
 OrderedDict = compat.OrderedDict
@@ -28,8 +26,6 @@ TooManyRedirects = exceptions.TooManyRedirects
 InvalidSchema = exceptions.InvalidSchema
 ChunkedEncodingError = exceptions.ChunkedEncodingError
 ContentDecodingError = exceptions.ContentDecodingError
-RecentlyUsedContainer: TypeAlias = _collections.RecentlyUsedContainer[_KT, _VT]
-CaseInsensitiveDict: TypeAlias = structures.CaseInsensitiveDict[_VT]
 HTTPAdapter = adapters.HTTPAdapter
 requote_uri = utils.requote_uri
 get_environ_proxies = utils.get_environ_proxies