Allow Symfony 8 (#26)

Author: bocharsky-bw

composer.json

@@ -14,9 +14,9 @@
         "php": ">=8.1"
     },
     "require-dev": {
-        "symfony/filesystem": "^6.3|^7.0",
-        "symfony/framework-bundle": "^6.3|^7.0",
-        "symfony/phpunit-bridge": "^6.3.9|^7.0",
+        "symfony/filesystem": "^6.3|^7.0|^8.0",
+        "symfony/framework-bundle": "^6.3|^7.0|^8.0",
+        "symfony/phpunit-bridge": "^6.3.9|^7.0|^8.0",
         "phpstan/phpstan": "^1.10.39",
         "phpunit/phpunit": "^9.6"
     },