Update actions/checkout action to v5 (#41)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://github.com/actions/checkout) | action | major | `v3` -> `v5` |

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### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

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

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

### [`v4`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v422)

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

- `url-helper.ts` now leverages well-known environment variables by [@&#8203;jww3](https://github.com/jww3) in [#&#8203;1941](https://github.com/actions/checkout/pull/1941)
- Expand unit test coverage for `isGhes` by [@&#8203;jww3](https://github.com/jww3) in [#&#8203;1946](https://github.com/actions/checkout/pull/1946)

</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: #41
Co-authored-by: Renovate Bot <renovate-bot@valverde.cloud>
Co-committed-by: Renovate Bot <renovate-bot@valverde.cloud>

packages/webapp/public/98.css/.github/workflows/npm-publish.yml

@@ -12,7 +12,7 @@ jobs:
   publish-npm:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
       - uses: actions/setup-node@v3
         with:
           node-version: 16