Update actions/setup-node action to v6 (#1750)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-node](https://github.com/actions/setup-node) | action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>actions/setup-node (actions/setup-node)</summary>

### [`v6`](https://github.com/actions/setup-node/compare/v5...v6)

[Compare Source](https://github.com/actions/setup-node/compare/v5...v6)

</details>

---

### Configuration

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **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 has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xMzUuNCIsInVwZGF0ZWRJblZlciI6IjQxLjEzNS40IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Reviewed-on: #1750
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

.gitea/workflows/lint-test-docker.yaml

@@ -37,7 +37,7 @@ jobs:
 
       - name: Set up Node.js
         if: steps.check-branch-exists.outputs.exists == 'true'
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: '24'