chore(deps): update actions/checkout action to v4 (#344)

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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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---

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.github/workflows/danger.yml

@@ -10,7 +10,7 @@ jobs:
     name: Review, Lint, Verify
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Danger
         uses: docker://ghcr.io/danger/danger-swift-with-swiftlint:3.15.0

.github/workflows/documentation.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: macos-latest
     steps:
       - # Checkout the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - # Install Ruby
         uses: ruby/setup-ruby@v1

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - # Checkout the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - # Install dependencies
         run: brew install xcbeautify
@@ -82,7 +82,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - # Checkout the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - # Install dependencies
         run: brew install xcbeautify