[gardener/etcd-backup-restore]

🏃 Others

• [OPERATOR] Introduced delta-snapshot-retention-period CLI flag to extend the configurable retention period for delta snapshots in etcd-backup-restore, enhancing flexibility for backup retention. by @seshachalam-yv [#669]
• [OPERATOR] Update alpine base image version to 3.18.4. by @shreyas-s-rao [#666]