.github/workflows/config.yml: use checkout@v4 see actions/checkout#1590

Author: k-okada

.github/workflows/config.yml

@@ -50,7 +50,7 @@ jobs:
           fi
 
       - name: Chcekout
-        uses: actions/checkout@v3.0.2
+        uses: actions/checkout@v4
 
       - name: Start X server
         run: |