Bump actions/checkout from 4.1.7 to 4.2.1 (#813)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 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@692973e...eef6144)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/auto-rebase.yml

@@ -8,7 +8,7 @@ jobs:
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/rebase')
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+    - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
     - name: Automatic Rebase
       uses: cirrus-actions/rebase@b87d48154a87a85666003575337e27b8cd65f691
       env:

.github/workflows/exercise-tests.yml

@@ -26,7 +26,7 @@ jobs:
         os: [ubuntu-22.04, windows-2022, macos-14]
 
     steps:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
 
       - uses: julia-actions/setup-julia@780022b48dfc0c2c6b94cfee6a9284850107d037
         with:
@@ -45,7 +45,7 @@ jobs:
     runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
 
       - name: Pull julia-test-runner image
         run: docker pull exercism/julia-test-runner