Use PEP 585 syntax wherever possible (#6717)

stdlib/turtle.pyi

@@ -1,22 +1,22 @@
 from tkinter import Canvas, Frame, PhotoImage
-from typing import Any, Callable, ClassVar, Dict, Sequence, Tuple, TypeVar, Union, overload
+from typing import Any, Callable, ClassVar, Sequence, TypeVar, Union, overload
 
 # Note: '_Color' is the alias we use for arguments and _AnyColor is the
 # alias we use for return types. Really, these two aliases should be the
 # same, but as per the "no union returns" typeshed policy, we'll return
 # Any instead.
-_Color = Union[str, Tuple[float, float, float]]
+_Color = Union[str, tuple[float, float, float]]
 _AnyColor = Any
 
 # TODO: Replace this with a TypedDict once it becomes standardized.
-_PenState = Dict[str, Any]
+_PenState = dict[str, Any]
 
 _Speed = Union[str, float]
-_PolygonCoords = Sequence[Tuple[float, float]]
+_PolygonCoords = Sequence[tuple[float, float]]
 
 # TODO: Type this more accurately
 # Vec2D is actually a custom subclass of 'tuple'.
-Vec2D = Tuple[float, float]
+Vec2D = tuple[float, float]
 
 class ScrolledCanvas(Frame): ...
 
@@ -251,7 +251,7 @@ class RawTurtle(TPen, TNavigator):
     # a compound stamp or not. So, as per the "no Union return" policy,
     # we return Any.
     def stamp(self) -> Any: ...
-    def clearstamp(self, stampid: int | Tuple[int, ...]) -> None: ...
+    def clearstamp(self, stampid: int | tuple[int, ...]) -> None: ...
     def clearstamps(self, n: int | None = ...) -> None: ...
     def filling(self) -> bool: ...
     def begin_fill(self) -> None: ...
@@ -516,7 +516,7 @@ def tilt(angle: float) -> None: ...
 # a compound stamp or not. So, as per the "no Union return" policy,
 # we return Any.
 def stamp() -> Any: ...
-def clearstamp(stampid: int | Tuple[int, ...]) -> None: ...
+def clearstamp(stampid: int | tuple[int, ...]) -> None: ...
 def clearstamps(n: int | None = ...) -> None: ...
 def filling() -> bool: ...
 def begin_fill() -> None: ...