Use tenv instead of tfenv

[kvendingoldo]

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

infrastructure/USE_TFENV.md

Line 17 in 8fc95d2

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