chore(deps): update helm release openstack-helm/cinder to v2026

Author: renovate[bot]

charts/argocd-understack/values.yaml

@@ -365,7 +365,7 @@ site:
     wave: 2
     # -- Chart version for Cinder
     # renovate: datasource=helm depName=cinder registryUrl=https://tarballs.opendev.org/openstack/openstack-helm
-    chartVersion: 2025.1.3+abd55b4a7
+    chartVersion: 2026.1.12+db238e7c3
 
   # -- Ironic (Bare Metal Service)
   ironic: