Upped minimum bolt version

Bugfix #70

Author: transistive

composer.json

@@ -32,7 +32,7 @@
         "php-http/message": "^1.0",
         "php-ds/php-ds": "1.*",
         "php-http/message-factory": "^1.0",
-        "stefanak-michal/bolt": "^2.3",
+        "stefanak-michal/bolt": "^2.5.1",
         "symfony/polyfill-php80": "^1.2"
     },
     "suggest": {