Update symfony/proxy-manager-bridge requirement from ^5.4 to ^6.0

Updates the requirements on [symfony/proxy-manager-bridge](https://github.com/symfony/proxy-manager-bridge) to permit the latest version.
- [Release notes](https://github.com/symfony/proxy-manager-bridge/releases)
- [Changelog](https://github.com/symfony/proxy-manager-bridge/blob/6.3/CHANGELOG.md)
- [Commits](symfony/proxy-manager-bridge@v5.4.0...v6.0.19)

---
updated-dependencies:
- dependency-name: symfony/proxy-manager-bridge
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -43,7 +43,7 @@
     "symfony/form": "^5.4",
     "symfony/framework-bundle": "^5.4",
     "symfony/mime": "^5.4",
-    "symfony/proxy-manager-bridge": "^5.4",
+    "symfony/proxy-manager-bridge": "^6.0",
     "symfony/runtime": "^5.4",
     "symfony/security-bundle": "^5.4",
     "symfony/stopwatch": "^5.4",