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)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [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] <support@github.com>

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
  # Execute the checks inside the container instead the VM.
  container: golangci/golangci-lint:v1.57.2-alpine
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  - run: |
  # We need this go flag because it started to error after golangci-lint is using Go 1.21.
  # TODO(slok): Remove it on next (>1.54.1) golangci-lint upgrade to check if this problem has gone.
@@ -20,7 +20,7 @@ jobs:
  name: Unit test
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  - uses: actions/setup-go@v4
  with:
  go-version-file: go.mod
@@ -35,7 +35,7 @@ jobs:
  kubernetes:
  [1.23.17, 1.24.17, 1.25.16, 1.26.14, 1.27.11, 1.28.7, 1.29.2]
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  - uses: actions/setup-go@v4
  with:
  go-version-file: go.mod