Fix broken zone flag for sks update command

[kobajagi]

Description

Adds missing switchClientZoneV3 call in sksUpdateCmd.

Checklist

(For exoscale contributors)

• Changelog updated (under Unreleased block)
• Testing

Testing

$ exo c sks update 836d52e7-3ce6-4af0-853f-c23253320d38 --name mycluster2 -z at-vie-1
error: "836d52e7-3ce6-4af0-853f-c23253320d38" not found in ListSKSClustersResponse: Not Found

$ go run . c sks update 836d52e7-3ce6-4af0-853f-c23253320d38 --name mycluster2 -z at-vie-1
 ✔ Updating SKS cluster "836d52e7-3ce6-4af0-853f-c23253320d38"... 21s
┼───────────────┼──────────────────────────────────────────────────────────────────┼
│  SKS CLUSTER  │                                                                  │
┼───────────────┼──────────────────────────────────────────────────────────────────┼
│ ID            │ 836d52e7-3ce6-4af0-853f-c23253320d38                             │
│ Name          │ mycluster2                                                       │
│ Description   │                                                                  │
│ Zone          │ at-vie-1                                                         │
│ Creation Date │ 2025-01-20 11:36:44 +0000 UTC                                    │
│ Auto-upgrade  │ false                                                            │
│ Endpoint      │ https://836d52e7-3ce6-4af0-853f-c23253320d38.sks-at-vie-1.exo.io │
│ Version       │ 1.31.3                                                           │
│ Service Level │ pro                                                              │
│ CNI           │ calico                                                           │
│ Add-Ons       │ exoscale-cloud-controller                                        │
│               │ metrics-server                                                   │
│ State         │ running                                                          │
│ Labels        │ n/a                                                              │
│ Nodepools     │ 95a543b6-6b50-4469-9f4b-26b99c545e9f | mycluster                 │
┼───────────────┼──────────────────────────────────────────────────────────────────┼