[types] fix *_frame type (may be None) (#15219)

Author: x42005e1f

stdlib/types.pyi

@@ -400,7 +400,7 @@ class GeneratorType(Generator[_YieldT_co, _SendT_contra, _ReturnT_co]):
     @property
     def gi_code(self) -> CodeType: ...
     @property
-    def gi_frame(self) -> FrameType: ...
+    def gi_frame(self) -> FrameType | None: ...
     @property
     def gi_running(self) -> bool: ...
     @property
@@ -429,7 +429,7 @@ class AsyncGeneratorType(AsyncGenerator[_YieldT_co, _SendT_contra]):
     @property
     def ag_code(self) -> CodeType: ...
     @property
-    def ag_frame(self) -> FrameType: ...
+    def ag_frame(self) -> FrameType | None: ...
     @property
     def ag_running(self) -> bool: ...
     __name__: str
@@ -462,13 +462,8 @@ class CoroutineType(Coroutine[_YieldT_co, _SendT_nd_contra, _ReturnT_nd_co]):
     def cr_await(self) -> Any | None: ...
     @property
     def cr_code(self) -> CodeType: ...
-    if sys.version_info >= (3, 12):
-        @property
-        def cr_frame(self) -> FrameType | None: ...
-    else:
-        @property
-        def cr_frame(self) -> FrameType: ...
-
+    @property
+    def cr_frame(self) -> FrameType | None: ...
     @property
     def cr_running(self) -> bool: ...
     @property