Use reactphp/async instead of clue/reactphp-block

[clue]

This changeset updates the test suite to use reactphp/async instead of the deprecated clue/reactphp-block. See https://github.com/reactphp/async.

Builds on top of #120, clue/reactphp-block#67, clue/reactphp-block#68 and clue/reactphp-redis#149
Supersedes / closes #110 and #111 (Thank you @dinooo13 for the initial work on this!)

[Copilot]

Pull request overview

Updates the test suite to replace deprecated clue/reactphp-block usage with reactphp/async, and adds additional socket cleanup to avoid leaving server sockets open during/after tests.

Changes:

• Replace Block\await() + Loop::get() with \React\Async\await() in functional test helpers.
• Track and close the primary SocketServer after each test, and close additional per-test sockets where applicable.
• Update composer.json dev dependencies to drop clue/block-react and add react/async.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
tests/FunctionalTest.php	Migrates blocking awaits to react/async and adds explicit socket shutdowns to prevent lingering listeners.
composer.json	Swaps dev dependency from clue/block-react to react/async.

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