The warning you are receiving is because you are using a deprecated method of managing your apt's keyring file. The apt-key command is no longer supported, and instead you should use the trusted.gpg.d folder. To fix this issue, you will need to move the key from the /etc/apt/trusted.gpg file to the /etc/apt/trusted.gpg.d folder. You can do this by running the following commands:

sudo mv /etc/apt/trusted.gpg /etc/apt/trusted.gpg.d/ sudo apt-key add /etc/apt/trusted.gpg.d/trusted.gpg

You should then be able to run apt update without the warning being displayed.
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