Err:11 https:\\pkg[.]cloudflareclient[.]com victoria Release
404 Not Found [IP: 2606:4700::6813:ec18 443]
Reading package lists... Done
E: The 'https:\\pkg[.]cloudflareclient[.]com victoria Release' repository does not have a Release file.
N: Updates from such a repository cannot be done securely and are therefore disabled by default.
N: See the apt-secure(8) manual page for details on creating repositories and configuring users.
Mint Victoria 21.X is based on Ubuntu 22.X. Try replacing victoria with jammy in your release file (either in /etc/apt/sources.list or files in /etc/apt/sources.list.d/) (but only for pkg.cloudflareclient.com)