Bump actions/checkout from 2 to 3

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](actions/checkout@v2...v3)

---
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/test.yml

@@ -31,7 +31,7 @@ jobs:
 
     name: ${{ matrix.ruby }} ${{ matrix.database }} rails-${{ matrix.gemfile }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - run: sudo apt-get update && sudo apt-get install libsqlite3-dev -y