Fix some CAPI annotations (#13081)

stdlib/@tests/stubtest_allowlists/common.txt

@@ -58,7 +58,6 @@ multiprocessing.synchronize.SemLock.release
 numbers.Number.__hash__  # typeshed marks this as abstract but code just sets this as None
 optparse.Values.__getattr__  # Some attributes are set in __init__ using setattr
 pickle.Pickler.reducer_override  # implemented in C pickler
-pyexpat.expat_CAPI
 select.poll  # Depends on configuration
 selectors.DevpollSelector  # Depends on configuration
 shutil.rmtree  # stubtest doesn't like that we have this as an instance of a callback protocol instead of a function
@@ -77,7 +76,6 @@ typing.type_check_only  # typing decorator that is not available at runtime
 unittest.mock.patch  # It's a complicated overload and I haven't been able to figure out why stubtest doesn't like it
 weakref.WeakKeyDictionary.update
 weakref.WeakValueDictionary.update
-xml.parsers.expat.expat_CAPI
 
 # ==========
 # TODO: Modules that exist at runtime, but are missing from stubs

stdlib/@tests/stubtest_allowlists/py38.txt

@@ -110,7 +110,6 @@ tkinter.Tk.__init__
 
 # Exists at runtime, but missing from stubs
 _?contextvars.ContextVar.__class_getitem__
-datetime.datetime_CAPI
 dummy_threading.ExceptHookArgs
 dummy_threading.Lock
 dummy_threading.RLock

stdlib/_socket.pyi

@@ -3,7 +3,7 @@ from _typeshed import ReadableBuffer, WriteableBuffer
 from collections.abc import Iterable
 from socket import error as error, gaierror as gaierror, herror as herror, timeout as timeout
 from typing import Any, SupportsIndex, overload
-from typing_extensions import TypeAlias
+from typing_extensions import CapsuleType, TypeAlias
 
 _CMSG: TypeAlias = tuple[int, int, bytes]
 _CMSGArg: TypeAlias = tuple[int, int, ReadableBuffer]
@@ -842,4 +842,4 @@ def if_nameindex() -> list[tuple[int, str]]: ...
 def if_nametoindex(oname: str, /) -> int: ...
 def if_indextoname(index: int, /) -> str: ...
 
-CAPI: object
+CAPI: CapsuleType

stdlib/datetime.pyi

@@ -2,7 +2,7 @@ import sys
 from abc import abstractmethod
 from time import struct_time
 from typing import ClassVar, Final, NoReturn, SupportsIndex, final, overload, type_check_only
-from typing_extensions import Self, TypeAlias, deprecated
+from typing_extensions import CapsuleType, Self, TypeAlias, deprecated
 
 if sys.version_info >= (3, 11):
     __all__ = ("date", "datetime", "time", "timedelta", "timezone", "tzinfo", "MINYEAR", "MAXYEAR", "UTC")
@@ -332,3 +332,5 @@ class datetime(date):
     def __sub__(self, value: Self, /) -> timedelta: ...
     @overload
     def __sub__(self, value: timedelta, /) -> Self: ...
+
+datetime_CAPI: CapsuleType

stdlib/pyexpat/__init__.pyi

@@ -2,7 +2,7 @@ from _typeshed import ReadableBuffer, SupportsRead
 from collections.abc import Callable
 from pyexpat import errors as errors, model as model
 from typing import Any, Final, final
-from typing_extensions import TypeAlias
+from typing_extensions import CapsuleType, TypeAlias
 from xml.parsers.expat import ExpatError as ExpatError
 
 EXPAT_VERSION: Final[str]  # undocumented
@@ -78,3 +78,5 @@ def ErrorString(code: int, /) -> str: ...
 def ParserCreate(
     encoding: str | None = None, namespace_separator: str | None = None, intern: dict[str, Any] | None = None
 ) -> XMLParserType: ...
+
+expat_CAPI: CapsuleType