[HttpClient] Fix PHP 8.5 deprecation using str_increment()

Author: nicolas-grekas

Response/AmpResponse.php

@@ -99,7 +99,8 @@ public function __construct(AmpClientState $multi, Request $request, array $opti
 
         $throttleWatcher = null;
 
-        $this->id = $id = self::$nextId++;
+        $this->id = $id = self::$nextId;
+        self::$nextId = str_increment(self::$nextId);
         Loop::defer(static function () use ($request, $multi, $id, &$info, &$headers, $canceller, &$options, $onProgress, &$handle, $logger, &$pause) {
             return new Coroutine(self::generateResponse($request, $multi, $id, $info, $headers, $canceller, $options, $onProgress, $handle, $logger, $pause));
         });

composer.json

@@ -26,6 +26,7 @@
         "psr/log": "^1|^2|^3",
         "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/http-client-contracts": "~3.4.4|^3.5.2",
+        "symfony/polyfill-php83": "^1.29",
         "symfony/service-contracts": "^2.5|^3"
     },
     "require-dev": {