remove unecessary Iterable base classes (#12810)

stdlib/traceback.pyi

@@ -231,7 +231,7 @@ class TracebackException:
     if sys.version_info >= (3, 11):
         def print(self, *, file: SupportsWrite[str] | None = None, chain: bool = True) -> None: ...
 
-class FrameSummary(Iterable[Any]):
+class FrameSummary:
     if sys.version_info >= (3, 11):
         def __init__(
             self,

stdlib/unittest/suite.pyi

@@ -5,7 +5,7 @@ from typing_extensions import TypeAlias
 
 _TestType: TypeAlias = unittest.case.TestCase | TestSuite
 
-class BaseTestSuite(Iterable[_TestType]):
+class BaseTestSuite:
     _tests: list[unittest.case.TestCase]
     _removed_tests: int
     def __init__(self, tests: Iterable[_TestType] = ()) -> None: ...