migrate from tfswitch to tenv

Hi! I saw that you're using tfswitch. It does not support Terragrunt and OpenTofu, so, I suggest you to switch to tool that can manage all of these tools together: https://github.com/tofuutils/tenv

Start by locating the repository's references to tfswitch and any setup or documentation that describes Terraform version management. Replace the relevant references with tenv, then verify that the documented Terraform sample setup still works with the new tool.

Written by the indexing model from the issue text.