Update go.yml

.github/workflows/go.yml

@@ -12,14 +12,14 @@ on:
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: riscv-builders
     steps:
     - uses: actions/checkout@v3
 
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.19
+        go-version: 1.21
 
     - name: Build
       run: go build -v ./...