Update .github/workflows/ci.yml

Author: hattya

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Go
         uses: actions/setup-go@v4
         with: