Update actions/setup-node action to v4 (#437)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-node](https://github.com/actions/setup-node) | action | major | `v1` -> `v4` |

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### Release Notes

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

### [`v4`](https://github.com/actions/setup-node/compare/v3...v4)

[Compare Source](https://github.com/actions/setup-node/compare/v3...v4)

### [`v3`](https://github.com/actions/setup-node/compare/v2...v3)

[Compare Source](https://github.com/actions/setup-node/compare/v2...v3)

### [`v2`](https://github.com/actions/setup-node/compare/v1...v2)

[Compare Source](https://github.com/actions/setup-node/compare/v1...v2)

</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 becomes conflicted, 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:eyJjcmVhdGVkSW5WZXIiOiIzNy4wLjAiLCJ1cGRhdGVkSW5WZXIiOiIzNy4wLjAiLCJ0YXJnZXRCcmFuY2giOiJkZXZlbG9wIn0=-->

Reviewed-on: #437
Reviewed-by: Vylpes <ethan@vylpes.com>
Co-authored-by: Renovate Bot <renovate@vylpes.com>
Co-committed-by: Renovate Bot <renovate@vylpes.com>

.forgejo/workflows/production.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use Node.js
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v4
       with:
         node-version: 18.x
     - run: npm ci

.forgejo/workflows/stage.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use Node.js
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v4
       with:
         node-version: 18.x
     - run: npm ci

.forgejo/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use Node.js
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v4
       with:
         node-version: 18.x
     - run: npm ci