chore(deps): update actions/checkout action to v4 (#21)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | major | `v3` -> `v4` |

---

### Release Notes

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

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

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

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

</details>

---

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.github/workflows/_init.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
         with:
           fetch-depth: 0
 

.github/workflows/_release.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
       - name: Load dependencies from cache
         uses: actions/cache@v3

.github/workflows/_test.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
       - name: Load dependencies from cache
         uses: actions/cache@v3