chore(package): update actions/checkout action to v6 (#2)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://github.com/actions/checkout) | action | major | `v4` → `v6` |

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### Release Notes

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

### [`v6.0.3`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v603)

[Compare Source](https://github.com/actions/checkout/compare/v6.0.2...v6.0.3)

- Fix checkout init for SHA-256 repositories by [@&#8203;yaananth](https://github.com/yaananth) in [#&#8203;2439](https://github.com/actions/checkout/pull/2439)
- fix: expand merge commit SHA regex and add SHA-256 test cases by [@&#8203;yaananth](https://github.com/yaananth) in [#&#8203;2414](https://github.com/actions/checkout/pull/2414)

### [`v6.0.2`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v602)

[Compare Source](https://github.com/actions/checkout/compare/v6.0.1...v6.0.2)

- Fix tag handling: preserve annotations and explicit fetch-tags by [@&#8203;ericsciple](https://github.com/ericsciple) in [#&#8203;2356](https://github.com/actions/checkout/pull/2356)

### [`v6.0.1`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v601)

[Compare Source](https://github.com/actions/checkout/compare/v6...v6.0.1)

- Add worktree support for persist-credentials includeIf by [@&#8203;ericsciple](https://github.com/ericsciple) in [#&#8203;2327](https://github.com/actions/checkout/pull/2327)

### [`v6.0.0`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v600)

[Compare Source](https://github.com/actions/checkout/compare/v6...v6)

- Persist creds to a separate file by [@&#8203;ericsciple](https://github.com/ericsciple) in [#&#8203;2286](https://github.com/actions/checkout/pull/2286)
- Update README to include Node.js 24 support details and requirements by [@&#8203;salmanmkc](https://github.com/salmanmkc) in [#&#8203;2248](https://github.com/actions/checkout/pull/2248)

### [`v6`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v603)

[Compare Source](https://github.com/actions/checkout/compare/v5.0.1...v6)

- Fix checkout init for SHA-256 repositories by [@&#8203;yaananth](https://github.com/yaananth) in [#&#8203;2439](https://github.com/actions/checkout/pull/2439)
- fix: expand merge commit SHA regex and add SHA-256 test cases by [@&#8203;yaananth](https://github.com/yaananth) in [#&#8203;2414](https://github.com/actions/checkout/pull/2414)

### [`v5.0.1`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v501)

[Compare Source](https://github.com/actions/checkout/compare/v5...v5.0.1)

- Port v6 cleanup to v5 by [@&#8203;ericsciple](https://github.com/ericsciple) in [#&#8203;2301](https://github.com/actions/checkout/pull/2301)

### [`v5.0.0`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v500)

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

- Update actions checkout to use node 24 by [@&#8203;salmanmkc](https://github.com/salmanmkc) in [#&#8203;2226](https://github.com/actions/checkout/pull/2226)

### [`v5`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v501)

[Compare Source](https://github.com/actions/checkout/compare/v4.3.1...v5)

- Port v6 cleanup to v5 by [@&#8203;ericsciple](https://github.com/ericsciple) in [#&#8203;2301](https://github.com/actions/checkout/pull/2301)

</details>

---

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Reviewed-on: #2

.github/workflows/release.yaml

@@ -14,7 +14,7 @@ jobs:
 
       # checkout repo
       - name: "checkout"
-        uses: "actions/checkout@v4"
+        uses: "actions/checkout@v6"
         with:
           fetch-depth: 0