change github workflow to use latest stable go version

.github/workflows/go.yml

@@ -8,13 +8,13 @@ jobs:
     steps:
 
     - name: Set up Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v4
       with:
-        go-version: "1.20"
+        go-version: 'stable'
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
 
     - name: Verify all files pass gofmt formatting
       run: if [ "$(gofmt -s -l . | wc -l)" -gt 0 ]; then gofmt -s -d .; exit 1; fi