fix: assertions error message

[ouduidui]

I find expect.assertions error message is inaccurate when it is asynchronous code.

The following example, it will throw a error that message is Error: expected number of assertions to be 2, but got 0.

But the accurate message is Error: expected number of assertions to be 2, but got 3.

test('assertions when asynchronous code', async() => {
  expect.assertions(2)
  await Promise.all([
    expect(1).toBe(1),
    expect(1).toBe(1),
    expect(1).toBe(1),
  ])
})

Reproduction: https://stackblitz.com/edit/node-misjca

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