Terraform 1.9 enhances input variable validations

Terraform 1.9 has been released, offering enhancements to input variable validations, a new string templating function, and other improvements. The update allows for cross-object referencing in input variable validations, expanding the scenarios that can be validated. Additionally, a new built-in templatestring function enables dynamic template rendering without saving it to a local disk. Other improvements include refactoring null_resourcetype and allowing provisioners in removedblocks.