build(deps-dev): update doctrine/doctrine-fixtures-bundle requirement

Updates the requirements on [doctrine/doctrine-fixtures-bundle](https://github.com/doctrine/DoctrineFixturesBundle) to permit the latest version.
- [Release notes](https://github.com/doctrine/DoctrineFixturesBundle/releases)
- [Commits](doctrine/DoctrineFixturesBundle@3.5.0...4.0.0)

---
updated-dependencies:
- dependency-name: doctrine/doctrine-fixtures-bundle
  dependency-type: direct:development
...

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

composer.json

@@ -36,7 +36,7 @@
         "bnf/phpstan-psr-container": "^1.0",
         "composer/semver": "^3.4",
         "doctrine/doctrine-bundle": "^2.12",
-        "doctrine/doctrine-fixtures-bundle": "^3.5",
+        "doctrine/doctrine-fixtures-bundle": "^4.0",
         "doctrine/orm": "^2.14 || ^3.0",
         "doctrine/persistence": "^3.1",
         "ekino/phpstan-banned-code": "^2.1",