Run tests on PHP 8.5 and update test environment

[clue]

Builds on top of #93, reactphp/socket#325, reactphp/promise#264, reactphp/event-loop#282, rize/UriTemplate#37, and clue/framework-x#297

[Copilot]

Pull request overview

This PR adds PHP 8.5 to the CI test matrix and updates dependencies to versions that support PHP 8.5. It also modifies reflection API usage in tests to conditionally call setAccessible() only on PHP versions prior to 8.1, where it's required.

Changes:

• Adds PHP 8.5 to the GitHub Actions CI workflow test matrix
• Updates react/event-loop, react/promise, react/socket, and rize/uri-template dependency versions
• Adds PHP version checks in ClientTest.php to conditionally call setAccessible() only on PHP < 8.1

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/ci.yml	Adds PHP 8.5 to the test matrix to ensure compatibility with the latest PHP version
composer.json	Updates dependency versions to support PHP 8.5 (event-loop ^1.6, promise ^3.3, socket ^1.17, uri-template ^0.4.1)
tests/ClientTest.php	Adds conditional checks to only call setAccessible() on PHP < 8.1, where it's required for accessing private properties via reflection

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