chore(deps): update actions/checkout action to 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

.github/workflows/renovate.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@a1ed1d0adddfdf138192d1fbe3150a80094dee6a # v40.3.1
         with: