Update symfony/var-dumper requirement from ^4.2 to ^5.4 (#18)

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/6.1/CHANGELOG.md)
- [Commits](symfony/var-dumper@v4.2.0...v5.4.13)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -17,7 +17,7 @@
         "ext-json": "*"
     },
     "require-dev": {
-        "symfony/var-dumper": "^4.2",
+        "symfony/var-dumper": "^5.4",
         "phpunit/phpunit": "^9.0",
         "friendsofphp/php-cs-fixer": "^3.11"
     },