Bump actions/checkout from 4.1.1 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@b4ffde6...eef6144)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.yml

@@ -32,7 +32,7 @@ jobs:
           toxenv: pre-commit
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+    - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
     - uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3 # v5
       with:
         python-version: ${{ matrix.python }}