PHP 8.4 deprecation fixes - Implicitly nullable parameters (#5)

Co-authored-by: Deepak Chaudhary <deepak@wizzy.ai>
Thanks!

Author: deepakdhanji

src/Exception/CommandJobException.php

@@ -6,7 +6,7 @@
 
 class CommandJobException extends Exception
 {
-    public function __construct($message = null, $code = 0, Exception $previous = null)
+    public function __construct(string $message = '', int $code = 0, ?Exception $previous = null)
     {
         parent::__construct($message, $code, $previous);
     }

src/Service/CommandJobFactory.php

@@ -43,7 +43,7 @@ public function __construct(
      * @throws ORMException
      * @throws OptimisticLockException
      */
-    public function createCommandJob(string $commandName, array $commandParams, int $entityId = null, string $entityClassName = null, Job $parentJob = null, JobRecurring $parentJobRecurring = null, ?DateTimeImmutable $postponedStartAt = null): Job
+    public function createCommandJob(string $commandName, array $commandParams, ?int $entityId = null, ?string $entityClassName = null, ?Job $parentJob = null, ?JobRecurring $parentJobRecurring = null, ?DateTimeImmutable $postponedStartAt = null): Job
     {
         // Check if user is loaded and is granted job creation
         if ($this->security->getUser() && !$this->security->isGranted(JobQueuePermissions::ROLE_JOB_CREATE)) {