Use rector Replace OpenAPI PHP annotations with Attributes, but note that you'll need to change the namespace from `OpenApi\Annotations` to `OpenApi\Attributes` after this is done.

rector.php

<?php declare(strict_types=1);

use Rector\Core\Configuration\Option;
use Rector\Php80\Rector\Class_\AnnotationToAttributeRector;
use Rector\Php80\ValueObject\AnnotationToAttribute;
use Rector\Symfony\Set\SymfonySetList;
use OpenApi\Annotations as OA;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
use Symfony\Component\Serializer\Annotation as Serializer;

return static function (ContainerConfigurator $containerConfigurator): void {
    $services = $containerConfigurator->services();
    $parameters = $containerConfigurator->parameters();

    // catch all the serializer annotations too
    $services->set(AnnotationToAttributeRector::class)->configure([
        new AnnotationToAttribute(Serializer\DiscriminatorMap::class),
        new AnnotationToAttribute(Serializer\Context::class),
        new AnnotationToAttribute(Serializer\Groups::class),
        new AnnotationToAttribute(Serializer\Ignore::class),
        new AnnotationToAttribute(Serializer\MaxDepth::class),
        new AnnotationToAttribute(Serializer\SerializedName::class),
    ]);

    $services->set(AnnotationToAttributeRector::class)->configure([
        new AnnotationToAttribute(OA\AdditionalProperties::class),
        new AnnotationToAttribute(OA\Attachable::class),
        new AnnotationToAttribute(OA\Components::class),
        new AnnotationToAttribute(OA\Contact::class),
        new AnnotationToAttribute(OA\Delete::class),
        new AnnotationToAttribute(OA\Discriminator::class),
        new AnnotationToAttribute(OA\Examples::class),
        new AnnotationToAttribute(OA\ExternalDocumentation::class),
        new AnnotationToAttribute(OA\Flow::class),
        new AnnotationToAttribute(OA\Get::class),
        new AnnotationToAttribute(OA\Head::class),
        new AnnotationToAttribute(OA\Header::class),
        new AnnotationToAttribute(OA\Info::class),
        new AnnotationToAttribute(OA\Items::class),
        new AnnotationToAttribute(OA\JsonContent::class),
        new AnnotationToAttribute(OA\License::class),
        new AnnotationToAttribute(OA\Link::class),
        new AnnotationToAttribute(OA\MediaType::class),
        new AnnotationToAttribute(OA\OpenApi::class),
        new AnnotationToAttribute(OA\Operation::class),
        new AnnotationToAttribute(OA\Options::class),
        new AnnotationToAttribute(OA\Parameter::class),
        new AnnotationToAttribute(OA\Patch::class),
        new AnnotationToAttribute(OA\PathItem::class),
        new AnnotationToAttribute(OA\PathParameter::class),
        new AnnotationToAttribute(OA\Post::class),
        new AnnotationToAttribute(OA\Property::class),
        new AnnotationToAttribute(OA\Put::class),
        new AnnotationToAttribute(OA\RequestBody::class),
        new AnnotationToAttribute(OA\Response::class),
        new AnnotationToAttribute(OA\Schema::class),
        new AnnotationToAttribute(OA\SecurityScheme::class),
        new AnnotationToAttribute(OA\Server::class),
        new AnnotationToAttribute(OA\ServerVariable::class),
        new AnnotationToAttribute(OA\Tag::class),
        new AnnotationToAttribute(OA\Trace::class),
        new AnnotationToAttribute(OA\Xml::class),
        new AnnotationToAttribute(OA\XmlContent::class)
    ]);
};