chore(deps): update actions/upload-pages-artifact action to v4 (#435)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/upload-pages-artifact](https://redirect.github.com/actions/upload-pages-artifact)
| action | major | `v3` -> `v4` |

---

### Release Notes

<details>
<summary>actions/upload-pages-artifact
(actions/upload-pages-artifact)</summary>

###
[`v4`](https://redirect.github.com/actions/upload-pages-artifact/compare/v3...v4)

[Compare
Source](https://redirect.github.com/actions/upload-pages-artifact/compare/v3...v4)

</details>

---

### Configuration

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any time (no schedule defined).

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

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rebase/retry checkbox.

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

---

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---

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.github/workflows/docs.yaml

@@ -55,7 +55,7 @@ jobs:
               uses: actions/configure-pages@v5
 
             - name: Upload GitHub Pages artifact
-              uses: actions/upload-pages-artifact@v3
+              uses: actions/upload-pages-artifact@v4
               with:
                   path: ./website/build