Merge pull request #117 from bastien-phi/fix-php-8.4-deprecations

Use explicit nullable type is Task::nextRunAt

src/Support/ScheduledTasks/Tasks/Task.php

@@ -99,7 +99,7 @@ public function previousRunAt(): CarbonInterface
         return Date::instance($dateTime);
     }
 
-    public function nextRunAt(CarbonInterface $now = null): CarbonInterface
+    public function nextRunAt(?CarbonInterface $now = null): CarbonInterface
     {
         $dateTime = (new CronExpression($this->cronExpression()))->getNextRunDate(
             $now ?? now(),