build(deps): Update terraform-google-modules/network/google requireme…

…nt from ~> 8.1 to ~> 9.1 (#33)

Updates the requirements on [terraform-google-modules/network/google](https://github.com/terraform-google-modules/terraform-google-network) to permit the latest version.
- [Release notes](https://github.com/terraform-google-modules/terraform-google-network/releases)
- [Changelog](https://github.com/terraform-google-modules/terraform-google-network/blob/master/CHANGELOG.md)
- [Commits](terraform-google-modules/terraform-google-network@v8.1.0...v9.1.0)

---
updated-dependencies:
- dependency-name: terraform-google-modules/network/google
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/complete/main.tf

@@ -10,7 +10,7 @@ provider "google" {
 
 module "vpc" {
   source  = "terraform-google-modules/network/google"
-  version = "~> 8.1"
+  version = "~> 9.1"
 
   project_id   = local.gcp_project_id
   network_name = "${local.name}-vpc"