ci: update Terraform to 1.10.4

Changelogs:
* 1.2
  - https://github.com/hashicorp/terraform/blob/v1.2/CHANGELOG.md
  - https://www.terraform.io/language/upgrade-guides/1-2
  - https://www.hashicorp.com/blog/terraform-1-2-improves-exception-handling-and-updates-to-the-cli-driven-workflow
* 1.3
  - https://github.com/hashicorp/terraform/blob/v1.3/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.3.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-3-improves-extensibility-and-maintainability-of-terraform-modules
* 1.4
  - https://github.com/hashicorp/terraform/blob/v1.4/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.4.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-4-improves-the-cli-experience-for-terraform-cloud
* 1.5
  - https://github.com/hashicorp/terraform/blob/v1.5/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.5.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-5-brings-config-driven-import-and-checks
* 1.6
  - https://github.com/hashicorp/terraform/blob/v1.6/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.6.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-6-adds-a-test-framework-for-enhanced-code-validation
* 1.7
  - https://github.com/hashicorp/terraform/blob/v1.7/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.7.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-7-adds-test-mocking-and-config-driven-remove
* 1.8
  - https://github.com/hashicorp/terraform/blob/v1.8/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.8.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-8-improves-extensibility-with-provider-defined-functions
* 1.9
  - https://github.com/hashicorp/terraform/blob/v1.9/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.9.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-9-enhances-input-variable-validations
* 1.10
  - https://github.com/hashicorp/terraform/blob/v1.10/CHANGELOG.md
  - https://developer.hashicorp.com/terraform/language/v1.10.x/upgrade-guides
  - https://www.hashicorp.com/blog/terraform-1-10-improves-handling-secrets-in-state-with-ephemeral-values

Fix #1720

Author: php-coder

infra/terraform/.terraform-version

@@ -1 +1 @@
-1.1.9
+1.10.4

infra/terraform/README.md

@@ -1,5 +1,7 @@
 # Provisioning a server with Terraform
 
+<!-- @todo #1720 Terraform: automate import of the existing resources -->
+
 * Install [tfenv](https://github.com/tfutils/tfenv) and terraform
   ```console
   $ brew install tfenv

infra/terraform/versions.tf

@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">= 1.1"
+  required_version = ">= 1.10"
 
   required_providers {
     digitalocean = {