chore(deps): update actions/checkout action to v4 (#8)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://github.com/actions/checkout) | action |
major | `v2` -> `v4` |

---

### Release Notes

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

###
[`v4`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400)

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

- [Support fetching without the --progress
option](https://github.com/actions/checkout/pull/1067)
-   [Update to node20](https://github.com/actions/checkout/pull/1436)

###
[`v3`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v360)

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

- [Fix: Mark test scripts with Bash'isms to be run via
Bash](https://github.com/actions/checkout/pull/1377)
- [Add option to fetch tags even if fetch-depth >
0](https://github.com/actions/checkout/pull/579)

</details>

---

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.github/workflows/commands.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ startsWith(github.event.comment.body, '/ok-to-test') && github.event.issue.pull_request }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - env:
           GH_TOKEN: ${{ github.token }}
         run: |