Remove Python 3.7 branches (#11238)

stdlib/gc.pyi

@@ -19,13 +19,7 @@ def disable() -> None: ...
 def enable() -> None: ...
 def get_count() -> tuple[int, int, int]: ...
 def get_debug() -> int: ...
-
-if sys.version_info >= (3, 8):
-    def get_objects(generation: int | None = None) -> list[Any]: ...
-
-else:
-    def get_objects() -> list[Any]: ...
-
+def get_objects(generation: int | None = None) -> list[Any]: ...
 def freeze() -> None: ...
 def unfreeze() -> None: ...
 def get_freeze_count() -> int: ...