chore(deps): update terraform gitlab to v18 (#48)

* chore(deps): update terraform gitlab to v18
---------

Co-authored-by: Jakub Jindra <jakub.jindra@cookielab.io>

Author: clb-robot

modules/gitlab/versions.tf

@@ -4,7 +4,7 @@ terraform {
   required_providers {
     gitlab = {
       source  = "gitlabhq/gitlab"
-      version = ">= 15.7, < 18.0"
+      version = ">= 15.7, < 19.0"
     }
   }
 }

versions.tf

@@ -9,7 +9,7 @@ terraform {
     }
     gitlab = {
       source  = "gitlabhq/gitlab"
-      version = ">= 15.7, < 18.0"
+      version = ">= 15.7, < 19.0"
     }
   }
 }