Bump actions/checkout from 2.3.4 to 3.0.2 (#22)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.4 to 3.0.2.
- [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/v2.3.4...v3.0.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

.github/workflows/cibuild.yml

@@ -37,7 +37,7 @@ jobs:
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v3.0.2
         with:
           submodules: recursive