[ci skip]: Bump actions/checkout from 2.3.5 to 2.4.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.5...v2.4.0)

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

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

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
  runs-on: ubuntu-20.04
  steps:
  - name: Checkout code
- uses: actions/checkout@v2.3.5
+ uses: actions/checkout@v2.4.0
  - name: Bump version
  uses: chamini2/bump-version@js
  id: version
@@ -22,7 +22,7 @@ jobs:
  env:
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  - name: Checkout code
- uses: actions/checkout@v2.3.5
+ uses: actions/checkout@v2.4.0
  with:
  ref: main
  - name: Set up QEMU