Update Terraform required version to 1.9 (#29)

* Update Terraform required version to 1.9

Bump the minimum required Terraform version from 1.4 to 1.9 to ensure compatibility with newer features and provider requirements.

* terraform-docs: automated action

---------

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

Author: jgiuliani

README.md

@@ -6,7 +6,7 @@ Truefoundry AWS platform features
 
 | Name | Version |
 |------|---------|
-| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | ~> 1.4 |
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | ~> 1.9 |
 | <a name="requirement_aws"></a> [aws](#requirement\_aws) | ~> 5.57 |
 
 ## Providers

versions.tf

@@ -1,5 +1,5 @@
 terraform {
-  required_version = "~> 1.4"
+  required_version = "~> 1.9"
 
   required_providers {
     aws = {