Update dependency phpunit/phpunit to v12.5.6 (#4785)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [phpunit/phpunit](https://phpunit.de/)
([source](https://redirect.github.com/sebastianbergmann/phpunit)) |
`12.5.5` → `12.5.6` |
![age](https://developer.mend.io/api/mc/badges/age/packagist/phpunit%2fphpunit/12.5.6?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/packagist/phpunit%2fphpunit/12.5.5/12.5.6?slim=true)
|

---

### Release Notes

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

###
[`v12.5.6`](https://redirect.github.com/sebastianbergmann/phpunit/releases/tag/12.5.6):
PHPUnit 12.5.6

[Compare
Source](https://redirect.github.com/sebastianbergmann/phpunit/compare/12.5.5...12.5.6)

##### Changed

- Reverted a change that caused a [build
failure](https://redirect.github.com/php/php-src/actions/runs/21052584327/job/60542023395#step:14:3729)
for the [PHP project's nightly community
job](https://phpunit.expert/articles/how-php-and-its-ecosystem-test-each-other.html?ref=github)

***

Learn how to install or update PHPUnit 12.5 in the
[documentation](https://docs.phpunit.de/en/12.5/installation.html).

##### Keep up to date with PHPUnit:

- You can follow
[@&#8203;phpunit@phpc.social](https://phpc.social/@&#8203;phpunit) to
stay up to date with PHPUnit's development.
- You can subscribe to the [PHPUnit
Updates](https://phpunit.de/newsletter) newsletter to receive updates
about and tips for PHPUnit.

</details>

---

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---

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---

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Author: renovate[bot]

composer.json

@@ -67,7 +67,7 @@
         "phpstan/phpstan-doctrine": "2.0.4",
         "phpstan/phpstan-phpunit": "2.0.6",
         "phpstan/phpstan-symfony": "2.0.6",
-        "phpunit/phpunit": "12.5.5",
+        "phpunit/phpunit": "12.5.6",
         "psalm/plugin-phpunit": "0.19.3",
         "psalm/plugin-symfony": "5.2.7",
         "rector/rector": "2.1.1",