[TASK] Update phpunit/phpunit requirement from ^10.5.17 to ^10.5.18

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.5.18/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@10.5.17...10.5.18)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -25,7 +25,7 @@
         "phpstan/phpstan-deprecation-rules": "^1.1",
         "phpstan/phpstan-phpunit": "^1.3.16",
         "phpstan/phpstan-strict-rules": "^1.5.3",
-        "phpunit/phpunit": "^10.5.17",
+        "phpunit/phpunit": "^10.5.18",
         "rector/rector": "^1.0.4",
         "spaze/phpstan-disallowed-calls": "^3.1",
         "squizlabs/php_codesniffer": "^3.9.1"