Use actions/setup-go v5, rename to match.

.github/workflows/go.yml

@@ -1,19 +1,19 @@
-name: Go Build
+name: Go Build & Test
 
 on:
   push:
   pull_request:
   workflow_dispatch:
 
 jobs:
-  build:
+  build_and_test:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
       uses: actions/checkout@v4
 
     - name: Setup Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: 1.21.1