Remove Python 3.8 exclusive branches from third-party packages

stubs/icalendar/icalendar/timezone/zoneinfo.pyi

@@ -1,14 +1,9 @@
 import datetime
-import sys
 from typing import Final, Literal
+from zoneinfo import ZoneInfo
 
 from dateutil.rrule import rrule, rruleset
 
-if sys.version_info >= (3, 9):
-    from zoneinfo import ZoneInfo
-else:
-    from backports.zoneinfo import ZoneInfo
-
 from ..cal import Timezone
 from ..prop import vRecur
 from .provider import TZProvider

stubs/mypy-extensions/mypy_extensions.pyi

@@ -1,5 +1,4 @@
 import abc
-import sys
 from _collections_abc import dict_items, dict_keys, dict_values
 from _typeshed import IdentityFunction, Unused
 from collections.abc import Mapping
@@ -27,17 +26,16 @@ class _TypedDict(Mapping[str, object], metaclass=abc.ABCMeta):
     def keys(self) -> dict_keys[str, object]: ...
     def values(self) -> dict_values[str, object]: ...
     def __delitem__(self, k: Never) -> None: ...
-    if sys.version_info >= (3, 9):
-        @overload
-        def __or__(self, value: Self, /) -> Self: ...
-        @overload
-        def __or__(self, value: dict[str, Any], /) -> dict[str, object]: ...
-        @overload
-        def __ror__(self, value: Self, /) -> Self: ...
-        @overload
-        def __ror__(self, value: dict[str, Any], /) -> dict[str, object]: ...
-        # supposedly incompatible definitions of `__or__` and `__ior__`:
-        def __ior__(self, value: Self, /) -> Self: ...  # type: ignore[misc]
+    @overload
+    def __or__(self, value: Self, /) -> Self: ...
+    @overload
+    def __or__(self, value: dict[str, Any], /) -> dict[str, object]: ...
+    @overload
+    def __ror__(self, value: Self, /) -> Self: ...
+    @overload
+    def __ror__(self, value: dict[str, Any], /) -> dict[str, object]: ...
+    # supposedly incompatible definitions of `__or__` and `__ior__`:
+    def __ior__(self, value: Self, /) -> Self: ...  # type: ignore[misc]
 
 def TypedDict(typename: str, fields: dict[str, type[Any]], total: bool = ...) -> type[dict[str, Any]]: ...
 @overload

stubs/regex/regex/regex.pyi

@@ -1,15 +1,12 @@
-import sys
 from _typeshed import ReadableBuffer, Unused
 from collections.abc import Callable, Mapping
+from types import GenericAlias
 from typing import Any, AnyStr, Generic, Literal, TypeVar, final, overload
 from typing_extensions import Self
 
 from . import _regex
 from ._regex_core import *
 
-if sys.version_info >= (3, 9):
-    from types import GenericAlias
-
 _T = TypeVar("_T")
 
 __version__: str
@@ -569,8 +566,7 @@ class Pattern(Generic[AnyStr]):
     ) -> _regex.Scanner[bytes]: ...
     def __copy__(self) -> Self: ...
     def __deepcopy__(self, memo: Unused, /) -> Self: ...
-    if sys.version_info >= (3, 9):
-        def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
+    def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
 @final
 class Match(Generic[AnyStr]):
@@ -648,5 +644,4 @@ class Match(Generic[AnyStr]):
     def __getitem__(self, key: int | str, /) -> AnyStr | Any: ...
     def __copy__(self) -> Self: ...
     def __deepcopy__(self, memo: Unused, /) -> Self: ...
-    if sys.version_info >= (3, 9):
-        def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
+    def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...

stubs/six/six/moves/_dummy_thread.pyi

@@ -1,6 +1 @@
-import sys
-
-if sys.version_info >= (3, 9):
-    from _thread import *
-else:
-    from _dummy_thread import *
+from _thread import *