MailCow Update by script returned the following hint:

First of all, it is necessary to upgrade Docker Compose version v2:

Subsequently, the following error message appears during the update attempt:

* error decoding 'Ports': Invalid ip address :: address ::: too many colons in address
Oh no, something went wrong. Please check the error message above.

Bug is fixed with a change in docker-compose.yml in line 379 to 381:

- "${HTTPS_BIND:-}:${HTTPS_PORT:-443}:${HTTPS_PORT:-443}" 
- "${HTTP_BIND:-}:${HTTP_PORT:-80}:${HTTP_PORT:-80}"


Afterwards, the update runs through flawlessly via the script: