avoid confusion by removing 3561-update.sql #5186

This script is referenced from
https://github.com/IQSS/dataverse/releases/tag/v4.8 and it's unclear
why it was not part of upgrade_v4.7.1_to_v4.8.sql

New contributors have found the presence of this script in the
"scripts/database" directory confusing and have assumed that the process
they should follow is to create a similar script, not knowing about our
upgrade_v4.7.1_to_v4.8.sql process.