Update actions/setup-go action to v6

Author: renovate[bot]

.github/workflows/go.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
 
       - name: Set up Go 1.21
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: 1.21
         id: go