Fork with gitlab_project doesn't have option to set branches

Bug Report

Currently doesn't seem to be an option to set the branches to fork via the gitlab_project. Trying to set one using the API as reference causes the code to fail.

API Reference: https://docs.gitlab.com/16.10/ee/api/projects.html#fork-project

Relevant Terraform Configuration

resource "gitlab_project" "gp" {
  name                                             = var.name
  description                                      = var.description
  only_allow_merge_if_all_discussions_are_resolved = true
  only_allow_merge_if_pipeline_succeeds            = true
  remove_source_branch_after_merge                 = true
  request_access_enabled                           = false
  initialize_with_readme                           = var.fork_from != null ? null : true
  keep_latest_artifact                             = false
  namespace_id                                     = var.namespace_id
  ci_config_path                                   = var.ci_config_path
  merge_method                                     = "ff"
  squash_option                                    = "default_on"
  visibility_level                                 = var.visibility
  archive_on_destroy                               = true
  forked_from_project_id                           = var.fork_from
  path                                             = var.path
  mr_default_target_self                           = true
  allow_merge_on_skipped_pipeline                  = false
  branches                                         = "master"
}

Relevant Terraform Command

terraform validate

Relevant Log Output

These are the debug logs of the `terraform` command output:

╷
│ Error: Unsupported argument
│ 
│   on modules/project/main.tf line 20, in resource "gitlab_project" "gp":
│   20:   branches = "master"
│ 
│ An argument named "branches" is not expected here.

Additional Details

• GitLab Terraform Provider Version: v16.11.0
• GitLab Version: v16.10.5-ee
• Terraform Version: v1.8.3