fix go version

.github/workflows/go.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.17.rc2
+        go-version: 1.17rc2
 
     - name: Build
       run: go build -v -o "vscode-winsta11er-$(matrix.goarch).exe"