chore(deps): Update Terraform terraform-google-modules/network/google to v12 (#169)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

examples/nat/main.tf

@@ -16,7 +16,7 @@
 
 module "vpc" {
   source  = "terraform-google-modules/network/google"
-  version = "~> 11.0"
+  version = "~> 12.0"
 
   project_id   = var.project_id
   network_name = "test-network"

examples/simple_example/main.tf

@@ -16,7 +16,7 @@
 
 module "vpc" {
   source  = "terraform-google-modules/network/google"
-  version = "~> 11.0"
+  version = "~> 12.0"
 
   project_id   = var.project_id
   network_name = "test-network"