Fix stim.pyi that includes stim.CircuitOperation

[nelimee]

The __init__.pyi file that is used for Python typing includes the following lines:

Stim/glue/python/src/stim/__init__.pyi

Lines 300 to 319 in e6fd563

	@overload
	def append(
	self,
	name: str,
	targets: Union[int, stim.GateTarget, Iterable[Union[int, stim.GateTarget]]],
	arg: Union[float, Iterable[float]],
	) -> None:
	pass
	@overload
	def append(
	self,
	name: Union[stim.CircuitOperation, stim.CircuitRepeatBlock],
	) -> None:
	pass
	def append(
	self,
	name: object,
	targets: object = (),
	arg: object = None,
	) -> None:

In particular, one of the overloads of Circuit.append is type-annotated with stim.CircuitOperation which seems like a typo/outdated reference to stim.CircuitInstruction:

Stim/glue/python/src/stim/__init__.pyi

Lines 309 to 312 in e6fd563

	def append(
	self,
	name: Union[stim.CircuitOperation, stim.CircuitRepeatBlock],
	) -> None:

This causes issues with type checkers, at least with Pyright in strict mode.

[Strilanc]

Nice catch