Bump actions/checkout from 2.3.4 to 4.1.7

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.4 to 4.1.7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.4...v4.1.7)

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

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

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.1.7
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.1.7
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
@@ -96,7 +96,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.1.7
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1