Debian 13 (Trixie) does not support apt-key method (hep_cli_installer.sh)


The apt-key utility is no longer available as of the Debian 13 release so we need to modernize this method.  

* See line 48 of hep_cli_installer.sh.

```
echo -e "Please insert the provided key to install hep_cli:"
read key
        curl -L https://$key:@packagecloud.io/qxip/hepic/gpgkey | apt-key add -
        sed -i "s/0000-0000-0000-deb/$key/g" /etc/apt/sources.list.d/qxip_hepic.list
```
