chore(deps): update tonistiigi/xx docker tag to v1.6.1 (#40)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [tonistiigi/xx](https://redirect.github.com/tonistiigi/xx) | stage |
patch | `1.6.0` -> `1.6.1` |

---

### Release Notes

<details>
<summary>tonistiigi/xx (tonistiigi/xx)</summary>

###
[`v1.6.1`](https://redirect.github.com/tonistiigi/xx/releases/tag/v1.6.1)

[Compare
Source](https://redirect.github.com/tonistiigi/xx/compare/v1.6.0...v1.6.1)

```dockerfile
FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.6.1 AS xx
```

#### What's Changed

- Fix additional possible `xx-cc/xx-cargo` compatibility issue with
Alpine 3.21
[https://github.com/tonistiigi/xx/pull/187](https://redirect.github.com/tonistiigi/xx/pull/187)

**Full Changelog**:
tonistiigi/xx@v1.6.0...v1.6.1

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/anza-labs/scribe).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS40Mi40IiwidXBkYXRlZEluVmVyIjoiMzkuNDIuNCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiYXJlYS9kZXBlbmRlbmN5Il19-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # Easy crosscomple toolkit
-FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.6.0 AS xx
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:1.6.1 AS xx
 
 # Build the manager binary
 FROM --platform=$BUILDPLATFORM docker.io/library/golang:1.23 AS builder