Updating tools/virheat from version 0.7.1 to 0.7.3

[gxydevbot]

Hello! This is an automated update of the following tool: tools/virheat. I created this PR because I think the tool's main dependency is out of date, i.e. there is a newer version available through conda.

I have updated tools/virheat from version 0.7.1 to 0.7.3.

Project home page: https://github.com/jonas-fuchs/virHEAT/releases

For any comments, queries or criticism about the bot, not related to the tool being updated in this PR, please create an issue here.

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[bgruening]

New param.