Bump phpunit/phpunit from 9.6.31 to 12.5.5

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.31 to 12.5.5.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/12.5.5/ChangeLog-12.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.31...12.5.5)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 12.5.5
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

composer.json

@@ -25,7 +25,7 @@
     "require-dev": {
         "doctrine/doctrine-fixtures-bundle": "^4.1",
         "phpstan/phpstan": "^2.1.17",
-        "phpunit/phpunit": "^9.6.23",
+        "phpunit/phpunit": "^12.5.5",
         "symfony/browser-kit": "8.0.*",
         "symfony/phpunit-bridge": "^8.0",
         "symplify/easy-coding-standard": "^13.0.0"