Use PEP 585 syntax wherever possible (#6717)

stdlib/importlib/metadata/__init__.pyi

@@ -7,7 +7,7 @@ from email.message import Message
 from importlib.abc import MetaPathFinder
 from os import PathLike
 from pathlib import Path
-from typing import Any, ClassVar, Iterable, NamedTuple, Pattern, Tuple, overload
+from typing import Any, ClassVar, Iterable, NamedTuple, Pattern, overload
 
 if sys.version_info >= (3, 10):
     from importlib.metadata._meta import PackageMetadata as PackageMetadata
@@ -101,6 +101,6 @@ if sys.version_info >= (3, 8):
     ) -> Iterable[Distribution]: ...
     def metadata(distribution_name: str) -> Message: ...
     def version(distribution_name: str) -> str: ...
-    def entry_points() -> dict[str, Tuple[EntryPoint, ...]]: ...
+    def entry_points() -> dict[str, tuple[EntryPoint, ...]]: ...
     def files(distribution_name: str) -> list[PackagePath] | None: ...
     def requires(distribution_name: str) -> list[str] | None: ...