Update module to use google provider >=6

[a88zach]

TL;DR

This PR should be merged and a new version created so that users can use google provider version >=6

Ideally, the version would be bumped to v35 first

Expected behavior

Cannot use gh-runner-gke with version >=6 of google provider

Observed behavior

Error: Failed to query available provider packages
│ 
│ Could not retrieve the list of available versions for provider hashicorp/google: locked provider registry.terraform.io/hashicorp/google 6.13.0 does not match configured version constraint >= 4.3.0,
│ >= 5.40.0, < 6.0.0, 6.13.0, < 7.0.0; must use terraform init -upgrade to allow selection of new versions
│ 
│ To see which modules are currently depending on hashicorp/google and what versions are specified, run the following command:
│     terraform providers

Providers required by configuration:
.
├── provider[registry.terraform.io/hashicorp/google] 6.13.0
└── module.runner-gke
    ├── provider[registry.terraform.io/hashicorp/helm] >= 2.0.0
    ├── provider[registry.terraform.io/hashicorp/google] >= 4.3.0, < 7.0.0
    ├── provider[registry.terraform.io/hashicorp/kubernetes] ~> 2.0
    └── module.runner-cluster
        ├── provider[registry.terraform.io/hashicorp/random] >= 2.1.0
        ├── provider[registry.terraform.io/hashicorp/google] >= 5.40.0, < 6.0.0
        ├── provider[registry.terraform.io/hashicorp/google-beta] >= 5.40.0, < 6.0.0
        └── provider[registry.terraform.io/hashicorp/kubernetes] ~> 2.10

Terraform Configuration

terraform {
  required_providers {
    google = {
      source  = "hashicorp/google"
      version = "6.13.0"
    }
  }

  required_version = "1.10.2"
}

provider "google" {
}

module "runner-gke" {
  source  = "terraform-google-modules/github-actions-runners/google//modules/gh-runner-gke"
  version = "4.0.0"

  project_id             = "*****"
  create_network         = true
  cluster_suffix         = "k8s"
  gh_app_id              = var.gh_app_id
  gh_app_installation_id = var.gh_app_installation_id
  gh_app_private_key     = var.gh_app_private_key
  gh_config_url          = var.gh_config_url
}

### Terraform Version

```sh
1.10.2

Additional information

No response