The CI job using the ftp download/upload does currently fail 1 and that was due to b19387e5 (tools/ftp-upload/Dockerfile: Use parallel transfer mode, 2024-04-11).
Documentation of the FTP server hoster 2 mentions that only up to 8 parallel connections are supported, so let's use 5 which is in the range of 2 to 8.
The CI job using the ftp download/upload does currently fail 1 and that was due to b19387e5 (tools/ftp-upload/Dockerfile: Use parallel transfer mode, 2024-04-11).
Documentation of the FTP server hoster 2 mentions that only up to 8 parallel connections are supported, so let's use 5 which is in the range of 2 to 8.