Update doctrine/data-fixtures requirement from ^1.4 to ^2.0

Updates the requirements on [doctrine/data-fixtures](https://github.com/doctrine/data-fixtures) to permit the latest version.
- [Release notes](https://github.com/doctrine/data-fixtures/releases)
- [Commits](doctrine/data-fixtures@1.4.0...2.0.0)

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

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

composer.json

@@ -52,7 +52,7 @@
     "symfony/framework-bundle": "^5.4|^6.4|^7.0",
     "symfony/var-dumper": "^5.4|^6.4|^7.0",
     "symfony/webpack-encore-bundle": "^1.12|^2.0",
-    "doctrine/data-fixtures": "^1.4"
+    "doctrine/data-fixtures": "^2.0"
   },
   "scripts": {
     "test": "XDEBUG_MODE=coverage ./vendor/bin/phpunit --colors=always",