build(deps): bump actions/checkout from 2 to 3 (#27)

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -56,7 +56,7 @@ jobs:
       BUNDLE_GEMFILE: gemfiles/rails${{ matrix.rails-version }}.gemfile
       DISPLAY: ":99.0"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
@@ -77,7 +77,7 @@ jobs:
           - "6.0"
           - "5"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Test
         run: |
           docker-compose run --rm ruby-2.7-rails-${{ matrix.rails-version }}