Support Swoole v6.1 and cleanup unused listener

[huangdijia]

Summary

• Add Swoole v6.1.1 to CI test matrix to ensure compatibility with the latest stable release
• Remove deprecated ResumeExitCoordinatorListener which is no longer needed

Changes

1. CI Enhancement: Updated .github/workflows/test.yml to include Swoole v6.1.1 in the test matrix
2. Code Cleanup: Removed app/Listener/ResumeExitCoordinatorListener.php as it's no longer required

Test Plan

• CI tests will run against Swoole v5.1.7, v6.0.2, v6.1.1, and master
• Verify all PHP versions (8.1, 8.2, 8.3, 8.4) work with the new Swoole version
• Confirm the application runs without the removed listener