Bug: [Vue warn] Non-function value encountered for default slot on stubbed teleport

**Describe the bug**
After update from 2.1.0 to 2.2.0, tests with `stubs: { teleport: true }` produce a warning:
```
[Vue warn]: Non-function value encountered for default slot. Prefer function slots for better performance.
  at <Teleport to="body" >
  at <Anonymous ref="VTU_COMPONENT" >
  at <VTUROOT>         
```


**To Reproduce**
Able to reproduce within VTU unit test
https://github.com/vuejs/test-utils/blob/6371349bd97e010169ed773b24a222ac3dc584e1/tests/mountingOptions/global.stubs.spec.ts#L514-L531


**Expected behavior**
Not print a warning

**Related information:**
- `@vue/test-utils` version: 2.2.0 
- `Vue` version: 3.2.41
- `node` version: 16.18.0
- `npm` (or `yarn`) version: pnpm@7.14.0

**Additional context**
I think this might come from the stubs refactoring and some previous special handling on the teleport child nodes, where they have been explicit passed as function:
https://github.com/vuejs/test-utils/blob/30e9c0c90ccfa5c7a90340ee29efce4935ed0d4d/src/stubs.ts#L208

	it('opts in to stubbing teleport ', () => {
	const Comp = {
	template: `<teleport to="body"><div id="content" /></teleport>`
	}
	const wrapper = mount(Comp, {
	global: {
	stubs: {
	teleport: true
	}
	}
	})

	expect(wrapper.html()).toBe(
	'<teleport-stub to="body">\n' +
	' <div id="content"></div>\n' +
	'</teleport-stub>'
	)
	})

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Bug: [Vue warn] Non-function value encountered for default slot on stubbed teleport #1829

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Bug: [Vue warn] Non-function value encountered for default slot on stubbed teleport #1829

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