Update Rook to 1.12.5 and Ceph to 18.2.0

This change updates Rook to the 1.12.5 release and Ceph to the
18.2.0 (Reef) release.

Change-Id: I546780ce33b6965aa699f1578d1db9790dc4e002

libvirt/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v1.0.0
 description: OpenStack-Helm libvirt
 name: libvirt
-version: 0.1.25
+version: 0.1.26
 home: https://libvirt.org
 sources:
   - https://libvirt.org/git/?p=libvirt.git;a=summary

libvirt/values.yaml

@@ -28,7 +28,7 @@ images:
   tags:
     libvirt: docker.io/openstackhelm/libvirt:latest-ubuntu_focal
     libvirt_exporter: vexxhost/libvirtd-exporter:latest
-    ceph_config_helper: 'docker.io/openstackhelm/ceph-config-helper:ubuntu_focal_17.2.6-1-20230508'
+    ceph_config_helper: 'docker.io/openstackhelm/ceph-config-helper:ubuntu_focal_18.2.0-1-20231013'
     dep_check: quay.io/airshipit/kubernetes-entrypoint:v1.0.0
     image_repo_sync: docker.io/library/docker:17.07.0
     kubectl: docker.io/bitnami/kubectl:latest