Merge pull request #14 from shugo/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 3 to 4

Author: shugo

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
         ruby: ['head', '3.1', '3.0', '2.7']
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}