Use str_increment() to fix PHP 8.5 deprecation

Author: nicolas-grekas

src/CompositeCancellation.php

@@ -69,7 +69,8 @@ public function __destruct()
 
     public function subscribe(\Closure $callback): string
     {
-        $id = $this->nextId++;
+        $id = $this->nextId;
+        \PHP_VERSION_ID >= 80300 ? $this->nextId = \str_increment($this->nextId) : ++$this->nextId;
 
         if ($this->exception) {
             EventLoop::queue($callback, $this->exception);

src/Internal/Cancellable.php

@@ -58,7 +58,8 @@ private function getException(): CancelledException
 
     public function subscribe(\Closure $callback): string
     {
-        $id = $this->nextId++;
+        $id = $this->nextId;
+        \PHP_VERSION_ID >= 80300 ? $this->nextId = \str_increment($this->nextId) : ++$this->nextId;
 
         if ($this->requested) {
             $exception = $this->getException();

src/Internal/FutureState.php

@@ -67,7 +67,8 @@ public function __destruct()
      */
     public function subscribe(\Closure $callback): string
     {
-        $id = self::$nextId++;
+        $id = self::$nextId;
+        \PHP_VERSION_ID >= 80300 ? $this->nextId = \str_increment($this->nextId) : ++$this->nextId;
 
         $this->handled = true; // Even if unsubscribed later, consider the future handled.