[Docs]: update climctl release numbers

### Issue Description

in the getting started guide, slimctl install is outdated.

### Prposed Solution

slimctl-v1.2.0 this is the latest

### Affected Component

SLIM

### Checklist

- [x] I have read the [contributing guidelines](/agntcy/repo-template/blob/main/CONTRIBUTING.md).
- [x] I have verified this does not duplicate an existing issue.