Update dependency amphp/http-server to v3

Author: renovate[bot]

composer.json

@@ -15,7 +15,7 @@
   },
   "require-dev": {
     "amphp/amp": "^2.6",
-    "amphp/http-server": "^2.1",
+    "amphp/http-server": "^3.0",
     "dms/phpunit-arraysubset-asserts": "dev-master",
     "ergebnis/composer-normalize": "^2.28",
     "friendsofphp/php-cs-fixer": "3.94.2",