I want to suggest a new step

I want topgrade to upgrade the database of ClamAV

Which tool is this about? Where is its repository?

It's a Cross-platform antivirus software. Repo: https://github.com/Cisco-Talos/clamav

Which operating systems are supported by this tool?

Windows, Linux, Mac

What should Topgrade do to figure out if the tool needs to be invoked?

check if freshclam exists in PATH.

Which exact commands should Topgrade run?

freshclam