chore(deps): update quay.io/ceph/ceph docker tag to v17.2.8

[renovate]

This PR contains the following updates:

Package	Update	Change
quay.io/ceph/ceph	patch	v17.2.6 -> v17.2.8

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[github-actions]

rook-ceph/rook-ceph-tools Deployment (apps/v1) ${\color{green}+1}$ ${\color{red}-1}$

 {
   apiVersion: "apps/v1"
   kind: "Deployment"
   spec: {
     template: {
       spec: {
         containers: [
           {
             name: "rook-ceph-tools"
-            image: "quay.io/ceph/ceph:v17.2.6"
+            image: "quay.io/ceph/ceph:v17.2.7"
           }
         ]
       }
     }
   }
 }

rook-ceph/rook-ceph CephCluster (ceph.rook.io/v1) ${\color{green}+1}$ ${\color{red}-1}$

 {
   apiVersion: "ceph.rook.io/v1"
   kind: "CephCluster"
   spec: {
     cephVersion: {
-      image: "quay.io/ceph/ceph:v17.2.6"
+      image: "quay.io/ceph/ceph:v17.2.7"
     }
   }
 }

[github-actions]

rook-ceph/rook-ceph-tools Deployment (apps/v1) ${\color{green}+1}$ ${\color{red}-1}$

 {
   apiVersion: "apps/v1"
   kind: "Deployment"
   spec: {
     template: {
       spec: {
         containers: [
           {
             name: "rook-ceph-tools"
-            image: "quay.io/ceph/ceph:v17.2.6"
+            image: "quay.io/ceph/ceph:v17.2.8"
           }
         ]
       }
     }
   }
 }

rook-ceph/rook-ceph CephCluster (ceph.rook.io/v1) ${\color{green}+1}$ ${\color{red}-1}$

 {
   apiVersion: "ceph.rook.io/v1"
   kind: "CephCluster"
   spec: {
     cephVersion: {
-      image: "quay.io/ceph/ceph:v17.2.6"
+      image: "quay.io/ceph/ceph:v17.2.8"
     }
   }
 }