chore(deps): update actions/upload-pages-artifact action to v5 (#33)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) | action | major | `v4` → `v5` |

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### Release Notes

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

### [`v5`](https://github.com/actions/upload-pages-artifact/compare/v4...v5)

[Compare Source](https://github.com/actions/upload-pages-artifact/compare/v4...v5)

</details>

---

### Configuration

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  - At any time (no schedule defined)
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---

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Reviewed-on: #33
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Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

.github/workflows/pages.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v6
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v5
         with:
           # Upload entire repository
           path: '.'