chore(deps): update actions/setup-node action to v6 (#109)

This PR contains the following updates:

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

---

### Release Notes

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

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

[Compare
Source](https://redirect.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 was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/openmcp-project/blueprint-workflows).

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

.github/workflows/check-dist.yml

@@ -33,7 +33,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm

.github/workflows/linter.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Setup Node.js
         id: setup-node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version-file: .node-version
           cache: npm