Downgrade auto-deploy-image to v2.25.0

In v2.26.0 we added support for the ingressClassName field and proactively used it when the networking.k8s.io/v1/Ingress API was available. The problem with this is that old ingress controllers don't provide an IngressClass, causing deployments to fail on old controllers. This likely affects a large number of users. See gitlab-org/cluster-integration/auto-deploy-image#206 (closed)