chore: upgrade testing workflow

Author: wenchyzhu

.github/workflows/testing.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.20
+          go-version: "1.20.x"
 
       - name: Checkout Code
         uses: actions/checkout@v4