Bump actions/checkout from 4.1.7 to 4.2.1 in the github-actions group (#592)

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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@v4.1.7...v4.2.1)

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

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

Author: dependabot[bot]

.github/workflows/benchmark.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
     # Base for comparison is master branch.
     - name: Checkout code
-      uses: actions/checkout@v4.1.7
+      uses: actions/checkout@v4.2.1
       with:
         ref: master
     - name: Install Go
@@ -25,7 +25,7 @@ jobs:
     # runner is in a shared environment and CPU and mem would be affected by others. (or so I think)
     - run: go test -run=none -bench=. -count=30 -benchtime=100ms -timeout=20m > /tmp/prev
     - name: Checkout code
-      uses: actions/checkout@v4.1.7
+      uses: actions/checkout@v4.2.1
     - run: go test -run=none -bench=. -count=30 -benchtime=100ms -timeout=20m > /tmp/curr
 
     - run: go install golang.org/x/perf/cmd/benchstat@latest