Update symfony/var-dumper requirement from ^6.0 to ^6.0 || ^7.0

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@v6.0.0...v7.2.0)

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

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

Author: dependabot[bot]

composer.json

@@ -29,7 +29,7 @@
         "phpstan/phpstan": "^2.0",
         "phpunit/phpunit": "^9.0",
         "psy/psysh": "^0.12.5",
-        "symfony/var-dumper": "^6.0",
+        "symfony/var-dumper": "^6.0 || ^7.0",
         "yoast/phpunit-polyfills": "^3.0"
     },
     "autoload": {