Bump phpspec/phpspec from 5.1.2 to 6.1.0

Bumps [phpspec/phpspec](https://github.com/phpspec/phpspec) from 5.1.2 to 6.1.0.
- [Release notes](https://github.com/phpspec/phpspec/releases)
- [Changelog](https://github.com/phpspec/phpspec/blob/master/CHANGES-v5.md)
- [Commits](phpspec/phpspec@5.1.2...6.1.0)

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

composer.json

@@ -49,7 +49,7 @@
         "fzaninotto/faker": "^1.8",
         "jakub-onderka/php-console-highlighter": "^0.4",
         "jakub-onderka/php-parallel-lint": "^1.0",
-        "phpspec/phpspec": "^5.0",
+        "phpspec/phpspec": "^6.1",
         "phpstan/phpstan": "^0.10.2",
         "phpunit/phpunit": "^7.5",
         "squizlabs/php_codesniffer": "^3.4",