Update dependency freezegun to v1.5.1 (#433)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [freezegun](https://togithub.com/spulec/freezegun)
([changelog](https://togithub.com/spulec/freezegun/blob/master/CHANGELOG))
| `==1.5.0` -> `==1.5.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/freezegun/1.5.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/freezegun/1.5.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/freezegun/1.5.0/1.5.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/freezegun/1.5.0/1.5.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>spulec/freezegun (freezegun)</summary>

###
[`v1.5.1`](https://togithub.com/spulec/freezegun/blob/HEAD/CHANGELOG#151)

[Compare
Source](https://togithub.com/spulec/freezegun/compare/1.5.0...1.5.1)

-   Fix the typing of the `tick()` method, and improve it's behaviour.

</details>

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