feat(Option): apply closure should be able to return mixed

src/Psl/Option/Option.php

@@ -230,7 +230,7 @@ public function proceed(Closure $some, Closure $none): mixed
     /**
      * Applies a function to a contained value and returns the original `Option<T>`.
      *
-     * @param (Closure(T): void) $closure
+     * @param (Closure(T): mixed) $closure
      *
      * @return Option<T>
      */