According to the DEPRECATION section of the apt-key man page:

Except for using apt-key del in maintainer scripts, the use of apt-key is deprecated. This section shows how to replace existing use of apt-key.

The man page contains some hints and an example how to convert command snippets with apt-key to a supported command.

Deprecated:

wget -qO- https://myrepo.example/myrepo.asc | sudo apt-key add -

Supported replacement:

wget -qO- https://myrepo.example/myrepo.asc | sudo tee /etc/apt/trusted.gpg.d/myrepo.asc

Recommended supported replacement (/etc/apt/keyrings/ is just an example, there is no recommended path):

wget -qO- https://myrepo.example/myrepo.asc | sudo tee /etc/apt/keyrings/myrepo.asc
deb [signed-by=/etc/apt/keyrings/myrepo.asc arch=amd64] https://myrepo.example/debian main