Fix type annotation for traceback.StackSummary.from_list() to include FrameSummary items (#8244)

Author: tiangolo

stdlib/traceback.pyi

@@ -252,7 +252,7 @@ class StackSummary(list[FrameSummary]):
         capture_locals: bool = ...,
     ) -> StackSummary: ...
     @classmethod
-    def from_list(cls, a_list: list[_PT]) -> StackSummary: ...
+    def from_list(cls, a_list: Iterable[FrameSummary | _PT]) -> StackSummary: ...
     if sys.version_info >= (3, 11):
         def format_frame_summary(self, frame_summary: FrameSummary) -> str: ...