Merge pull request #12 from github/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 2 to 4

Author: khiga8

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
           - '2.7'
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: