Use tenv instead of tfswitch

Hi, I've noticed that you're using tfswitch for version management. It's sad, but tfswitch does not support OpenTofu. My team created a project tenv that supports Terraform, OpenTofu and Terragrunt in one tool. I suggest to migrate to it, because it allow you to manage everything related to Terraform just by one tool.

You're also welcome to open any issues or contribute to tenv.

Github reference: https://github.com/MatthewJohn/terrareg/issues/42