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/AsyncQueue.php

@@ -17,7 +17,7 @@
 
 /**
  * @mixin DriverFactory
- * @property string|null $queue
+ * @property null|string $queue
  */
 class AsyncQueue extends Facade
 {

src/Kafka.php

@@ -17,7 +17,7 @@
 
 /**
  * @mixin ProducerManager
- * @property string|null $queue
+ * @property null|string $queue
  */
 class Kafka extends Facade
 {