chore: update nyholm/psr7 dependency to version ^1.8.0 in composer.json and composer.lock to support PHP 8.4

Author: RobinTheHood

composer.json

@@ -14,7 +14,7 @@
         "robinthehood/debug": "^0.1.4",
         "erusev/parsedown": "^1.7",
         "sebastian/diff": "^4.0",
-        "nyholm/psr7": "^1.4",
+        "nyholm/psr7": "^1.8.0",
         "nyholm/psr7-server": "^1.0",
         "kriswallsmith/buzz": "^1.2"
     },