Update actions/checkout action to v4 (#6)

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This PR contains the following updates:

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

</details>

---

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.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
     continue-on-error: ${{ matrix.experimental }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
         uses: actions/setup-node@v3
         with:
@@ -44,7 +44,7 @@ jobs:
     name: Lint Code
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
           node-version: "lts/*"

.github/workflows/codeql-analysis.yml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL