Bump actions/checkout from 3 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     name: Rubocop
     runs-on: 'ubuntu-latest'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: '3.3'
@@ -58,7 +58,7 @@ jobs:
     continue-on-error: ${{ matrix.allow_failure || endsWith(matrix.ruby, 'head') }}
     env: ${{ matrix.env }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           bundler: ${{ matrix.bundler || 2 }}