Update symfony/phpunit-bridge requirement from ^3.0|^4.0 to ^5.0.6

Updates the requirements on [symfony/phpunit-bridge](https://github.com/symfony/phpunit-bridge) to permit the latest version.
- [Release notes](https://github.com/symfony/phpunit-bridge/releases)
- [Changelog](https://github.com/symfony/phpunit-bridge/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/phpunit-bridge/commits/v5.0.6)

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

composer.json

@@ -38,7 +38,7 @@
         "phpstan/phpstan-phpunit": "^0.11",
         "phpunit/phpunit": "^7.5|^8.1",
         "sensiolabs/security-checker": "^6.0",
-        "symfony/phpunit-bridge": "^3.0|^4.0"
+        "symfony/phpunit-bridge": "^5.0.6"
     },
 
     "scripts": {