Update matthiasnoback/symfony-config-test requirement

Updates the requirements on [matthiasnoback/symfony-config-test](https://github.com/matthiasnoback/SymfonyConfigTest) to permit the latest version.
- [Release notes](https://github.com/matthiasnoback/SymfonyConfigTest/releases)
- [Changelog](https://github.com/SymfonyTest/SymfonyConfigTest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matthiasnoback/SymfonyConfigTest/commits/4.3.0)

---
updated-dependencies:
- dependency-name: matthiasnoback/symfony-config-test
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -78,7 +78,7 @@
         "blackfire/php-sdk": "^1.14",
         "ekino/phpstan-banned-code": "^1.0",
         "infection/infection": "^0.26",
-        "matthiasnoback/symfony-config-test": "^3.1|^4.0",
+        "matthiasnoback/symfony-config-test": "^4.3.0",
         "nyholm/psr7": "^1.3",
         "php-http/mock-client": "^1.0",
         "php-parallel-lint/php-parallel-lint": "^1.3",