🐛 ensure $when->minute is cast to int for Carbon::setDateTime

Added explicit `(int)` cast to fix a `TypeError` caused by `floor()` returning a float. This resolves the issue where Carbon's `setDateTime()` expects `$minute` as an int.

Author: MrKrisKrisu

app/DataProviders/CachedHafas.php

@@ -45,7 +45,7 @@ public function getDepartures(Station $station, Carbon $when, int $duration = 15
         $when       = clone $when;
         $when->subMinutes(2);
         // set cache when minutes to 0, 15, 30 or 45
-        $when->minute = floor($when->minute / 15) * 15;
+        $when->minute = (int) (floor($when->minute / 15) * 15);
         $when->second = 0;
 
         // set duration longer than 15 minutes