Update checkout to v4

Author: atilaneves

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
           - 12.0.0
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: ruby/setup-ruby@v1
         with: