Make code_owner_approval_required ForceNew

This seems like the simplest approach to fixing the test failure, since for this resource type an update and a create are essentially the same thing.

Author: armsnyder

gitlab/resource_gitlab_branch_protection.go

@@ -43,6 +43,7 @@ func resourceGitlabBranchProtection() *schema.Resource {
 			"code_owner_approval_required": {
 				Type:     schema.TypeBool,
 				Optional: true,
+				ForceNew: true,
 			},
 		},
 	}