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)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@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/test.yaml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         ruby: ['head', '3.2', '3.1', '3.0', '2.7', '2.6', '2.5']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
@@ -29,7 +29,7 @@ jobs:
       matrix:
         ruby: ['head']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
@@ -39,7 +39,7 @@ jobs:
   check-misc:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # Copy from https://github.com/ruby/ruby/blob/089227e94823542acfdafa68541d330eee42ffea/.github/workflows/check_misc.yml#L27
       - name: Check for trailing spaces
         run: |
@@ -52,7 +52,7 @@ jobs:
       matrix:
         ruby: ['head']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
@@ -71,7 +71,7 @@ jobs:
       run:
         working-directory: ../ruby/build
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.baseruby }}