Add support for sebastian/diff 6.0 (#692)

Author: IsraelPinheiro

Diff for: composer.json

@@ -30,7 +30,7 @@
         "php-parallel-lint/php-parallel-lint": "^1.3.2",
         "psr/container": "^1.0|^2.0.2",
         "psr/simple-cache": "^1.0|^2.0|^3.0",
-        "sebastian/diff": "^4.0|^5.0.3",
+        "sebastian/diff": "^4.0|^5.0.3|^6.0",
         "slevomat/coding-standard": "^8.14.1",
         "squizlabs/php_codesniffer": "^3.7.2",
         "symfony/cache": "^5.4|^6.0|^7.0",