ci: add tests for PHP 8.5

Author: Chris8934

src/Client.php

@@ -43,11 +43,13 @@ public static function createWithConfig(array $config): Client
         return new self(self::buildClient($config));
     }
 
+    #[\Override]
     public function sendRequest(RequestInterface $request): ResponseInterface
     {
         return $this->sendAsyncRequest($request)->wait();
     }
 
+    #[\Override]
     public function sendAsyncRequest(RequestInterface $request)
     {
         $promise = $this->guzzle->sendAsync($request);

src/Promise.php

@@ -70,16 +70,19 @@ public function __construct(PromiseInterface $promise, RequestInterface $request
         });
     }
 
+    #[\Override]
     public function then(?callable $onFulfilled = null, ?callable $onRejected = null)
     {
         return new static($this->promise->then($onFulfilled, $onRejected), $this->request);
     }
 
+    #[\Override]
     public function getState()
     {
         return $this->state;
     }
 
+    #[\Override]
     public function wait($unwrap = true)
     {
         $this->promise->wait(false);