Drop Python 3.8 branches (#13776)

stdlib/keyword.pyi

@@ -1,11 +1,7 @@
-import sys
 from collections.abc import Sequence
 from typing import Final
 
-if sys.version_info >= (3, 9):
-    __all__ = ["iskeyword", "issoftkeyword", "kwlist", "softkwlist"]
-else:
-    __all__ = ["iskeyword", "kwlist"]
+__all__ = ["iskeyword", "issoftkeyword", "kwlist", "softkwlist"]
 
 def iskeyword(s: str, /) -> bool: ...
 
@@ -13,9 +9,8 @@ def iskeyword(s: str, /) -> bool: ...
 # type it as a sequence
 kwlist: Final[Sequence[str]]
 
-if sys.version_info >= (3, 9):
-    def issoftkeyword(s: str, /) -> bool: ...
+def issoftkeyword(s: str, /) -> bool: ...
 
-    # a list at runtime, but you're not meant to mutate it;
-    # type it as a sequence
-    softkwlist: Final[Sequence[str]]
+# a list at runtime, but you're not meant to mutate it;
+# type it as a sequence
+softkwlist: Final[Sequence[str]]