chore(deps): update huangdijia/php-coding-standard to ^2.4 (#911)

* chore(deps): update huangdijia/php-coding-standard to ^2.4

Updates the PHP coding standard package from ^2.0 to ^2.4 to get the latest improvements and fixes.

* style: apply PHP coding standard fixes after updating to ^2.4

Reorders union types to follow null-first convention and applies other
code style improvements as required by the updated huangdijia/php-coding-standard package.

This commit includes automatic fixes across multiple components:
- Union type reordering (Type|null → null|Type)
- Consistent formatting and style improvements
- No functional changes, only code style compliance

---------

Co-authored-by: Deeka Wong <8337659+huangdijia@users.noreply.github.com>

Author: huangdijia

src/Subscriber/TriggerSubscriber.php

@@ -151,7 +151,7 @@ protected function loop(): void
                 try {
                     while (true) {
                         while (true) {
-                            /** @var array{0:class-string,1:string,2:array}|false|null $payload */
+                            /** @var null|array{0:class-string,1:string,2:array}|false $payload */
                             $payload = $this->chan?->pop();
 
                             if (! is_array($payload)) {