Fix compatibility with PHP 8.2 (#58)

Author: azjezz

src/EventLoop/Internal/DriverCallback.php

@@ -24,7 +24,7 @@ public function __construct(
      */
     public function __get(string $property): never
     {
-        throw new \Error("Unknown property '${property}'");
+        throw new \Error("Unknown property '{$property}'");
     }
 
     /**
@@ -33,6 +33,6 @@ public function __get(string $property): never
      */
     public function __set(string $property, mixed $value): never
     {
-        throw new \Error("Unknown property '${property}'");
+        throw new \Error("Unknown property '{$property}'");
     }
 }