Bump actions/checkout from 2 to 3 (#291)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [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...v3)

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

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

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

.github/workflows/publish.yml

@@ -16,7 +16,7 @@ jobs:
     - uses: hecrj/setup-rust-action@v1
       with:
         rust-version: ${{ matrix.rust }}
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v3
     - name: Login to crates.io
       run: cargo login $CRATES_IO_TOKEN
       env: