Bump phpstan/phpstan-phpunit from 2.0.14 to 2.0.15

Bumps [phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit) from 2.0.14 to 2.0.15.
- [Release notes](https://github.com/phpstan/phpstan-phpunit/releases)
- [Commits](phpstan/phpstan-phpunit@2.0.14...2.0.15)

---
updated-dependencies:
- dependency-name: phpstan/phpstan-phpunit
  dependency-version: 2.0.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -5,7 +5,7 @@
         "php-parallel-lint/php-parallel-lint": "1.4",
         "phpstan/phpstan": "2.1.38",
         "phpstan/phpstan-deprecation-rules": "2.0.3",
-        "phpstan/phpstan-phpunit": "2.0.14",
+        "phpstan/phpstan-phpunit": "2.0.15",
         "phpstan/phpstan-strict-rules": "2.0.8",
         "phpstan/phpstan-symfony": "2.0.13",
         "spaze/phpstan-disallowed-calls": "4.8.0",