Use tenv instead of tfenv

[kvendingoldo]

Hi. Great repo! I see that you use tfenv here:

bou/docs/software.md

Line 112 in 10c77b9

* terraform: `brew install tfenv`

I suggest you to switch to tenv: https://github.com/tofuutils/tenv:

• it is a successor of tofuenv and tfenv
• can manage versions of OpenTofu / Terraform / Terragrunt and Atmos
• does not require any dependencies like jq / bash / etc