Update out of date debian installation instructions

Author: lwronski

website/docs/_advanced_install.mdx

@@ -69,7 +69,7 @@ scala-cli version
 Scala CLI can be installed via [apt](https://wiki.debian.org/Apt) packager tool.
 
 ```bash
-curl -s --compressed "https://virtuslab.github.io/scala-cli-packages/KEY.gpg" | sudo apt-key add -
+curl -sS "https://virtuslab.github.io/scala-cli-packages/KEY.gpg" | sudo gpg --dearmor  -o /etc/apt/trusted.gpg.d/scala-cli.gpg 2>/dev/null
 sudo curl -s --compressed -o /etc/apt/sources.list.d/scala_cli_packages.list "https://virtuslab.github.io/scala-cli-packages/debian/scala_cli_packages.list"
 sudo apt update
 sudo apt install scala-cli