fix(#82): handle provider version as list in .terraform.lock.hcl

[harlemtraveler]

Description

This PR resolves a TypeError that occurs when .terraform.lock.hcl contains the version field as a string, but recent versions of Terraform may emit the value as a list. This causes a TypeError within the get_provider_version_from_lock_file() function.

.terraform.lock.hcl content

provider "registry.terraform.io/hashicorp/aws" {
  version = "5.100.0"

Error returned from /bin/tflocal

TypeError: expected string or bytes-like object, got 'list'

Fix

This fix checks for a list and safely parses the first element if necessary.

[bentsku]

Hello @harlemtraveler and thanks for a lot for the contribution! It seems the CI is failing with the change, but I'm not too sure why.

Could you please share how to reproduce the issue so maybe we could add a test case for it, or that I could reproduce the issue myself?

I've tried running the CI on the main branch and it passed, so I suppose this change is breaking something but not too sure why without a reproducer. Thanks!