Bump hashicorp/azurerm from 4.14.0 to 4.16.0 in /code/infra

Bumps [hashicorp/azurerm](https://github.com/hashicorp/terraform-provider-azurerm) from 4.14.0 to 4.16.0.
- [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@v4.14.0...v4.16.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

code/infra/terraform.tf

@@ -4,7 +4,7 @@ terraform {
   required_providers {
     azurerm = {
       source  = "hashicorp/azurerm"
-      version = "4.14.0"
+      version = "4.16.0"
     }
     azapi = {
       source  = "azure/azapi"