Update KUBESPRAY_VERSION (#8922)

As a step of release process, this updates KUBESPRAY_VERSION.
Thank you so much for creating and pushing container images of
the new version floryut !

.gitlab-ci.yml

@@ -8,7 +8,7 @@ stages:
   - deploy-special
 
 variables:
-  KUBESPRAY_VERSION: v2.18.1
+  KUBESPRAY_VERSION: v2.19.0
   FAILFASTCI_NAMESPACE: 'kargo-ci'
   GITLAB_REPOSITORY: 'kargo-ci/kubernetes-sigs-kubespray'
   ANSIBLE_FORCE_COLOR: "true"