Bump hashicorp/azurerm in /src/testing/loadtest-locust/infra (#556)

Bumps [hashicorp/azurerm](https://github.com/hashicorp/terraform-provider-azurerm) from 3.16.0 to 3.18.0.
- [Release notes](https://github.com/hashicorp/terraform-provider-azurerm/releases)
- [Changelog](https://github.com/hashicorp/terraform-provider-azurerm/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-provider-azurerm@v3.16.0...v3.18.0)

---
updated-dependencies:
- dependency-name: hashicorp/azurerm
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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src/testing/loadtest-locust/infra/main.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     azurerm = {
       source  = "hashicorp/azurerm"
-      version = "3.16.0"
+      version = "3.18.0"
     }
   }