Improve PHP 8.5+ support by updating to Promise v3.3 and avoiding deprecated setAccessible() calls in tests

[clue]

This changeset improves PHP 8.5+ support by updating to Promise v3.3 and avoiding deprecated setAccessible() calls in tests. With these changes applied, tests against the current PHP 8.5 RC pass without errors.

Builds on top of reactphp/promise#264, #281, #265, #267 and others
Refs https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_reflectionsetaccessible and php/php-src#19273

[Copilot]

Pull Request Overview

This PR improves PHP 8.5+ compatibility by updating the React/Promise dependency to version 3.3 and wrapping deprecated setAccessible() calls in conditional checks based on PHP version. The changes ensure tests pass without deprecation warnings on PHP 8.5 RC.

• Updates React/Promise dependency from ^3.2 to ^3.3 for better PHP 8.5 support
• Adds PHP version checks around setAccessible() calls to avoid deprecation warnings
• Maintains backward compatibility with older PHP versions while supporting PHP 8.5+

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
composer.json	Updates react/promise dependency to version 3.3
tests/Io/RouteHandlerTest.php	Wraps setAccessible() calls with PHP version checks
tests/Io/ReactiveHandlerTest.php	Wraps setAccessible() calls with PHP version checks
tests/Io/LogStreamHandlerTest.php	Wraps setAccessible() calls with PHP version checks
tests/ErrorHandlerTest.php	Wraps setAccessible() calls with PHP version checks
tests/AppTest.php	Wraps setAccessible() calls with PHP version checks
tests/AppMiddlewareTest.php	Wraps setAccessible() calls with PHP version checks
tests/AccessLogHandlerTest.php	Wraps setAccessible() calls with PHP version checks

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}