Update dependency phpunit/phpunit to ^9.6.13 (#185)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [phpunit/phpunit](https://phpunit.de/)
([source](https://togithub.com/sebastianbergmann/phpunit)) | require-dev
| patch | `^9.6.12` -> `^9.6.13` |

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### Release Notes

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

###
[`v9.6.13`](https://togithub.com/sebastianbergmann/phpunit/compare/9.6.12...9.6.13)

[Compare
Source](https://togithub.com/sebastianbergmann/phpunit/compare/9.6.12...9.6.13)

</details>

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composer.json

@@ -49,7 +49,7 @@
     "phpstan/phpstan-deprecation-rules": "^1.1.4",
     "phpstan/phpstan-phpunit": "^1.3.14",
     "phpstan/phpstan-strict-rules": "^1.5.1",
-    "phpunit/phpunit": "^9.6.12",
+    "phpunit/phpunit": "^9.6.13",
     "psr/container": "^2.0",
     "rector/rector": "^0.18.3"
   },