build(deps): 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)
- [Commits](https://github.com/actions/checkout/compare/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/release.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.ref }}
           path: src/github.com/containerd/containerd
@@ -93,7 +93,7 @@ jobs:
           releasever="${releasever#refs/tags/}"
           echo "RELEASE_VER=${releasever}" >> $GITHUB_ENV
       - name: Checkout containerd
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Intentionally use github.repository instead of containerd/containerd to
           # make this action runnable on forks.