chore(deps): Update dependency phpunit/phpunit to v10.5.20 (#13)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [phpunit/phpunit](https://phpunit.de/)
([source](https://togithub.com/sebastianbergmann/phpunit)) | `10.5.19`
-> `10.5.20` |
[![age](https://developer.mend.io/api/mc/badges/age/packagist/phpunit%2fphpunit/10.5.20?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/packagist/phpunit%2fphpunit/10.5.20?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/packagist/phpunit%2fphpunit/10.5.19/10.5.20?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>sebastianbergmann/phpunit (phpunit/phpunit)</summary>

###
[`v10.5.20`](https://togithub.com/sebastianbergmann/phpunit/compare/10.5.19...10.5.20)

[Compare
Source](https://togithub.com/sebastianbergmann/phpunit/compare/10.5.19...10.5.20)

</details>

---

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