Regression: root-level invoked services not stopped after reaching final state

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Description

When an interpreted machine reaches a final state, services invoked at the root level are no longer stopped.

#3126 changed the way the interpreter is stopped when this.state.done, calling the new _stop method where previously stop was called. stop handles stopping all children:

xstate/packages/core/src/interpreter.ts

Lines 664 to 668 in f2bf492

	this.children.forEach((child) => {
	if (isFunction(child.stop)) {
	child.stop();
	}
	});

Expected result

When a service reaches a final state, all invoked services are stopped.

Actual result

When a service reaches a final state, services invoked at the root are not stopped.

Reproduction

https://codesandbox.io/s/kind-diffie-ewx8qk?file=/src/index.ts

Additional context

Reproduction of previous behavior (xstate@4.32.1): https://codesandbox.io/s/modern-rain-4serhm

[Andarist]

Thank you for the report, It got fixed by #3523 and the new release is already out.

[with-heart]

@Andarist You're the best! Ty 💖