chore(deps): update actions/deploy-pages action to v5 (#31)

This PR contains the following updates:

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

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### Release Notes

<details>
<summary>actions/deploy-pages (actions/deploy-pages)</summary>

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

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

</details>

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### 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.

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #31
Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk>
Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

.github/workflows/pages.yml

@@ -39,4 +39,4 @@ jobs:
           path: '.'
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v5