Update symfony/var-dumper requirement from ^6.4.15 to ^6.4.15 || ^7.0.0

Updates the requirements on [symfony/var-dumper](https://github.com/symfony/var-dumper) to permit the latest version.
- [Release notes](https://github.com/symfony/var-dumper/releases)
- [Changelog](https://github.com/symfony/var-dumper/blob/7.2/CHANGELOG.md)
- [Commits](symfony/var-dumper@v6.4.15...v7.2.0)

---
updated-dependencies:
- dependency-name: symfony/var-dumper
  dependency-type: direct:development
...

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

composer.json

@@ -37,7 +37,7 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.65.0",
         "phpunit/phpunit": "^11.4.4",
-        "symfony/var-dumper": "^6.4.15",
+        "symfony/var-dumper": "^6.4.15 || ^7.0.0",
         "guzzlehttp/psr7": "^2.7",
         "phpstan/phpstan": "^2.0.3",
         "phpstan/phpstan-phpunit": "^2.0.1",