Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
       group: test
       cancel-in-progress: true # would be nice if GH offered cancel-pending instead, https://github.com/orgs/community/discussions/63136
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
           go-version-file: 'go.mod'
@@ -48,7 +48,7 @@ jobs:
   #   name: Unit Tests
   #   runs-on: ubuntu-latest
   #   steps:
-  #     - uses: actions/checkout@v3
+  #     - uses: actions/checkout@v4
   #     - uses: actions/setup-go@v5
   #       with:
   #         go-version-file: 'go.mod'