chore(deps): bump the actions group with 2 updates (#72)

Bumps the actions group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action).


Updates `actions/checkout` from 2 to 4
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

Updates `docker/setup-buildx-action` from 2.8.0 to 3.1.0
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v2.8.0...v3.1.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: docker/setup-buildx-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Peter Shen <xianpeng.shen@gmail.com>

.github/workflows/CI.yml

@@ -24,10 +24,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2.8.0
+        uses: docker/setup-buildx-action@v3.1.0
 
       - name: Check formatting
         run: make install-deps && make lint