[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](https://github.com/actions/checkout/compare/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] <support@github.com>

.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