Pin provider major version

[juliocc]

Currently we use a version constraint of the form >= 5.0.0 which allows major upgrades to happen. The recent release of version 5 of the provider broke a few modules and impacted a few users as the upgrade to v5 happened automatically.

This issues is to discuss whether it makes sense to change our default constraints to >= 5.0.0, < 6.0.0 as shown below:

terraform {
  required_version = ">= 1.4.4"
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = ">= 5.0.0, < 6.0.0" # tftest
    }
    google-beta = {
      source  = "hashicorp/google-beta"
      version = ">= 5.0.0, < 6.0.0" # tftest
    }
  }
}

This would allow free upgrades within version 5 of the provider and prevent any major version upgrades.

Thoughts?