merge: chore(deps): update module gitlab.com/gitlab-org/api/client-go to v0.121.0

This MR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [gitlab.com/gitlab-org/api/client-go](https://gitlab.com/gitlab-org/api/client-go) | require | minor | `v0.120.0` -> `v0.121.0` |

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### Release Notes

<details>
<summary>gitlab-org/api/client-go (gitlab.com/gitlab-org/api/client-go)</summary>

### [`v0.121.0`](https://gitlab.com/gitlab-org/api/client-go/tags/v0.121.0)

[Compare Source](https://gitlab.com/gitlab-org/api/client-go/compare/v0.120.0...v0.121.0)

#### 0.121.0 (2025-01-31)

No changes.

</details>

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See merge request !99