Update actions/checkout action to v4.2.1

| datasource  | package          | from   | to     |
| ----------- | ---------------- | ------ | ------ |
| github-tags | actions/checkout | v4.1.7 | v4.2.1 |


## [vv4.2.1](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v421)

-   Check out other refs/\* by commit if provided, fall back to ref by [@orhantoy](https://github.com/orhantoy) in actions/checkout#1924


## [vv4.2.0](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v420)

-   Add Ref and Commit outputs by [@lucacome](https://github.com/lucacome) in actions/checkout#1180
-   Dependency updates by [@dependabot-](https://github.com/dependabot-) actions/checkout#1777, actions/checkout#1872

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.1
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4