Update symfony/var-dumper requirement from ^5.4 to ^6.4

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/7.0/CHANGELOG.md)
- [Commits](symfony/var-dumper@v5.4.0...v6.4.2)

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

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

composer.json

@@ -29,7 +29,7 @@
         "psr/http-message": "^1.0",
         "psr/log": "^2.0|^3.0",
         "symfony/console": "^5.4|^6.0",
-        "symfony/var-dumper": "^5.4",
+        "symfony/var-dumper": "^6.4",
         "yiisoft/aliases": "^3.0",
         "yiisoft/arrays": "^2.0|^3.0",
         "yiisoft/config": "^1.3",