Fix crash when unpacking return value from overload - #21830

Fixes #21824
Fixes #19920
Closes #19921

Note that ilevkivskyi has a suggestion to change overload inference
here:
#19920 (comment)

While that is right, it is a little separate, and I think it is okay to
remove the crash given that it now affects numpy and has been reported
in other contexts too. We just keep the originally inferred tuple

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [mypy](https://github.com/python/mypy) ([changelog](https://mypy.readthedocs.io/en/latest/changelog.html)) | `==2.3.0` → `==2.3.1` | ![age](https://developer.mend.io/api/mc/badges/age/pypi/mypy/2.3.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mypy/2.3.0/2.3.1?slim=true) |

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### Release Notes

<details>
<summary>python/mypy (mypy)</summary>

### [`v2.3.1`](https://github.com/python/mypy/blob/HEAD/CHANGELOG.md#Mypy-231)

[Compare Source](python/mypy@v2.3.0...v2.3.1)

- Fix mypyc crash on double yielding Iterators (Daniël van Noord, PR [21826](python/mypy#21826))
- Fix mypyc `default_factory` for inherited dataclass (Daniël van Noord, PR [21785](python/mypy#21785))
- Clear mypyc coroutine env on coroutine completion (Piotr Sawicki, PR [21734](python/mypy#21734))
- Fix crash when unpacking return value from overload (Shantanu, PR [21830](python/mypy#21830))

</details>

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