Since Ubuntu 22.04 / Debian 11 apt-key is deprecated. Storing gpg-keys in /etc/apt/trusted.gpg (default behavior) is now producing warnings.
Also it is not longer recommended to get the gpg-keys via keyserver for security purposes.
The recommended way is to provide the gpg-key in /etc/apt/keyrings/KEY.gpg and add '[ signed-by = PATH ]' to the docker.list-file.

The puppetlabs/apt-Module has already implemented the new way of key handling via #991.
In my opinion the docker::repos class has to handle releases above Ubuntu 22.04 and Debian 11 different.