Version constraint on providers and Terraform binary about ocp4-upi-powervs

[yussufsh]

Just for understanding purpose:

~> 0.12.2 is equivalent to >= 0.12.2 < 0.13

[Prajyot-Parab]

@yussufsh This configurations worked fine for me as per required constraints

terraform {
  required_version = "~> 0.12.2"
  required_providers {
    ibm = "~> 1.11"
    ignition = "~> 1.2"
    null = "~> 2.1"
    random = "~> 2.3"
  }
}

[yussufsh]

Time to raise a PR then.. thanks @Prajyot-Parab .