Cast presigned URL lifespan to integer (#5515)

Author: HerrSammyDE

config/backups.php

@@ -10,7 +10,7 @@
 
     // This value is used to determine the lifespan of UploadPart presigned urls that wings
     // uses to upload backups to S3 storage.  Value is in minutes, so this would default to an hour.
-    'presigned_url_lifespan' => env('BACKUP_PRESIGNED_URL_LIFESPAN', 60),
+    'presigned_url_lifespan' => (int) env('BACKUP_PRESIGNED_URL_LIFESPAN', 60),
 
     // This value defines the maximal size of a single part for the S3 multipart upload during backups
     // The maximal part size must be given in bytes. The default value is 5GB.