update checkout version

Author: clarkedb

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       BUNDLE_WITHOUT: development:test
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Ruby 3.1
         uses: ruby/setup-ruby@v1